Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)  

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)  

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)  

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Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

DOI： 10.1109/ICAwST.2019.8923148

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Publishing type：Research paper (scientific journal)  

DOI： 10.17487/RFC8502

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Publishing type：Research paper (scientific journal)  

DOI： 10.17487/RFC8503

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/ICBIR.2018.8391159

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/ICBIR.2018.8391160

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Authorship：Lead author   Language：Japanese  

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.3837/tiis.2018.08.003

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

DOI： 10.1109/ICOIN.2018.8343098

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

DOI： 10.1109/IWCMC.2017.7986343

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Language：Japanese   Publisher：Organizing Committee of Tohoku-Section Joint Convention of Institutes of Electrical and Information Engineers, Japan  

DOI： 10.11528/tsjc.2017.0_148

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Language：Japanese   Publisher：Organizing Committee of Tohoku-Section Joint Convention of Institutes of Electrical and Information Engineers, Japan  

DOI： 10.11528/tsjc.2016.0_28

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

DOI： 10.1109/APNOMS.2014.6996575

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

DOI： 10.1109/NOMS.2014.6838382

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

DOI： 10.1109/GCCE.2013.6664801

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Language：English   Publishing type：Research paper (scientific journal)  

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Publishing type：Research paper (international conference proceedings)   Publisher：ACM  

DOI： 10.1145/2388576.2388608

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.4236/jis.2012.31003

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Language：Japanese   Publisher：電気関係学会東北支部連合大会実行委員会  

DOI： 10.11528/tsjc.2012.0_168

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Language：English   Publishing type：Research paper (scientific journal)  

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1109/JCN.2011.6157407

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DOI： 10.1109/MWC.2010.5416347

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Scopus

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Publishing type：Research paper (international conference proceedings)   Publisher：IEEE Computer Society  

DOI： 10.1109/CNSR.2009.33

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

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Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

DOI： 10.1109/WCNC.2008.462

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Publishing type：Research paper (international conference proceedings)   Publisher：IEEE Computer Society  

DOI： 10.1109/CBMS.2008.23

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Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

DOI： 10.1109/GLOCOM.2008.ECP.370

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/CHINACOM.2008.4685116

Web of Science

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.comcom.2008.05.033

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Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

DOI： 10.1109/ICC.2008.322

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Research

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publisher：Information Processing Society of Japan (IPSJ)  

DoS attacks pose a serious threat to the integrity of the Internet. Many countermeasures against DoS attacks have been proposed, among which traceback is a promising countermeasure. However, it is necessary to facilitate a collaborative mechanism among multiple networks in order to locate an attacker in practical situations. To develop such an effective mechanism, relevant entities from the academia, industry, and government should collaborate. As the first step towards fulfill this vision, we consider one of the important network management issues, i.e., DoS traceback, and develop a collaborative DoS traceback technology for an intranet security system via industry-university cooperation.

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Other Link： http://id.nii.ac.jp/1001/00010057/

Language：Japanese   Publisher：一般社団法人情報処理学会  

DoS attacks pose a serious threat to the integrity of the Internet. Many countermeasures against DoS attacks have been proposed, among which traceback is a promising countermeasure. However, it is necessary to facilitate a collaborative mechanism among multiple networks in order to locate an attacker in practical situations. To develop such an effective mechanism, relevant entities from the academia, industry, and government should collaborate. As the first step towards fulfill this vision, we consider one of the important network management issues, i.e., DoS traceback, and develop a collab...

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Language：English   Publishing type：Research paper (international conference proceedings)  

Web of Science

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Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

DOI： 10.1109/ICC.2007.236

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/GLOCOM.2006.526

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)  

Web of Science

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/ICC.2006.254989

Scopus

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/ICC.2006.254989

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Authorship：Lead author,　Corresponding author  

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1002/ecja.10205

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1002/ecja.20215

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1109/ISM.2005.49

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

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Language：English   Publishing type：Research paper (scientific journal)  

Web of Science

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1109/JSAC.2003.819977

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Language：English   Publishing type：Research paper (other academic)  

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Research

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Language：English   Publishing type：Research paper (scientific journal)  

Web of Science

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Research

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CiNii Research

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Language：English   Publisher：The Institute of Electronics, Information and Communication Engineers  

Log messages are generated by operating systems and applications. These messages contain important information about the health and operation of the system. The messages are also of great significance for security management, audit-checks, and forensics in an intranet. So, a logging system that originates, relays, collects and archives log messages, must be monitored and managed just like all other components of the ICT infrastructure, to ensure that it is operating normally i.e., the logs are being collected and archived as desired. In the Internet, some progress has been made towards the standardization of the syslog protocol but, to date, the management aspect of syslog has been neglected, for all practical purposes. In this paper, we focus the monitoring aspect of syslog applications. Some implementation of syslog applications have the functionality to generate statistics regarding the number of log messages. Such statistics is vital information to understand the operational status of syslog applications. In order to realize remote monitoring of those statistics, we discuss the design of Management Information Base and demonstrate prototype implementation of the MIB.

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CiNii Research

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昨今ネットワーク機器を始めとした情報システムの省電力化の要求が強まっている。我々は，キャンパスネットワークについて，設計時からの省電力化について研究を行っている。 そのなかで，ネットワーク機器などの個々の消費電力の測定や電源制御が重要であることがわかった。しかし，既存の電力測定システムではコストや測定精度の面で，問題があることがわかった。また，エッジスイッチなどのネットワーク機器の電源を個別に制御することで，省電力効果が向上できることも明らかになった。 そこで，組込み機器を用いて，ネットワーク経由で電力測定と電源制御などができる機器を開発し，コストや機能の面での検討を含めて検証を行った。

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Language：Japanese  

J-GLOBAL

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Research

J-GLOBAL

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

We have been promoted research and development under the support of the Green ICT Innovation Promotion (PREDICT) of Ministry of Internal Affairs and Communications for the duration of 2011 to 2014. This paper reports vision and achievement of our project. In this project, we propose a Green-oriented Network Management Framework to realize an energy-saving network system without using power consumption monitoring devices such as a power meter. To realize it, we develop visualization of waste and autonomy of waste reduction. We also aim to standard G-MIB in IETF. We have participated IETF meeting 5 times to discuss our G-MIB since 2012.

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J-GLOBAL

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

In this paper, we propose an estimation method of power consumptions based on network information to realize energy-saving of network systems without using a smart meter. We also propose a Green-oriented Management Information Base (G-MIB) to monitor the network device status and aim it for standardization in IETF. We have participated IETF Meeting 5 times to present and discuss our G-MIB.

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J-GLOBAL

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J-GLOBAL

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

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J-GLOBAL

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Language：English   Publisher：Forum on Information Technology  

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Language：Japanese   Publisher：Forum on Information Technology  

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J-GLOBAL

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J-GLOBAL

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J-GLOBAL

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J-GLOBAL

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ネットワーク機器について，稼動時の消費電力の低減や使用していないポートの機能停止などで省電力化が図られている。 これまでの研究から，大学などの学内ネットワークは，常に稼働している機器，断続的に稼働する機器，昼間の業務時間のみ稼働する機器などが接続されていることがわかった。また，スイッチの配置の工夫により，これらの機器の接続先をある程度まとめることができることがわかった。 そこで，夜間利用されていない機器を集めて接続したスイッチについて，夜間機器自体の電源を落とすことにより省電力化を図る方法を提案した。今回は，小規模な実験用ネットワークを構成し，実機でその効果を検討する。

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イントラネットの省電力化は重要な課題となっており，機器の稼働時の消費電力を低減するなど様々なアプローチがなされている．一方で，これまでの研究から，イントラネットのユーザ端末が電源のみ投入され実際にはログオンされずに長時間放置されている「無駄な稼働」の存在がわかっている．そこで，本研究では，ログオン画面でのみ起動するスクリーンセーバにより，一定時間未ログオンの端末を自動的にシャットダウンをすることにより無駄な稼働の抑制を試み，それによる消費電力を削減に与える効果を検証する．

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Research

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現在本学では，学内ネットワークの基盤ネットワークシステムの更改を検討している。新システムでは，電力消費の可視化の機能の実装や，無駄な機器の削減などを行い，省電力化を進める計画である。省電力化に向けた基礎データとして，現在の学内LANに設置されている情報センター管理のネットワーク機器について，ポートごとのUP/DOWN情報を定期的に取得した。そして，この情報を元にポートの利用状況を可視化することで，実稼動中の学内LANの機器の動作状況を把握し，利用されていない，または利用が少ない機器の洗い出しを行った。これらの結果による，省電力化やネットワークシステムの再設計の検討について報告する。

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Language：Japanese  

J-GLOBAL

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

For a long time, global warming has become an international concern and reducing power consumption is strongly required for reducing CO2. In addition, power shortages caused by the Great East Japan Earthquake need prompt actions for cutting power consumption. The power consumption by the Internet is one of key issues because it is estimated that the traffic volume of the Internet keeps increasing and power consumption of routers is considered to become a serious problem. For reducing the power consumption, we must fully understand the network components, topologies, and activities of every component in order to find out the cause of wasted power consumption. For removing the cause of the wasted power consumption, we need to control network components. This paper describes that network management technologies will play an important role for such purpose. As a first step, we propose to use the configuration management information, connection history of terminals in intranets, for estimating the activities of terminals. Then we show that the cause of wasted power consumption can be figured out by using the estimated terminal activities.

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CiNii Research

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Language：Japanese   Publishing type：Rapid communication, short report, research note, etc. (bulletin of university, research institution)  

J-GLOBAL

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DOI： 10.11528/tsjc.2011.0_88

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J-GLOBAL

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J-GLOBAL

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Language：Japanese   Publishing type：Rapid communication, short report, research note, etc. (bulletin of university, research institution)  

J-GLOBAL

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

A Image communication system using multiple cellular phone lines was developed. The communication system is designed to be able to increase its communication band dynamically by joining available deveices which are connecting phone line. To avoid its communication performance decrement, the system restrains the use of acknowlegedment, and adopts multiplex packet transmission. The communication performance and considerations will be reported though the communication experiment using multiple cellular phone lines.

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CiNii Research

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

A person-to-person imformation sharing is easily realized by P2P networks that serves are unnecessary to do so. Leakages of information, which are caused by malicious accesses for P2P netwroks, has become new social issues. To prevent information leakage, it is necessary to detect and block traffics of P2P software. Since some P2P softwares can spoof port numbers, it is difficult to detec the traffics sent from P2P softwares by using port numbers. It is more difficult to devise effective countermeasures for detecting the software because their protocol are not public. In this report, we propose an identification method of network application using response time for each application message and the number of packets to transmit a message.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Logs generated by operating systems and application programs provide important information to a network administrator. Logs are used for various purposes including security management, audit, and forensics of intranet. To use logs for such purposes, it is important that logs are reliably retrieved from hosts in the intranet. Mobile terminals introduce a new issue due to their mobility and wireless links those are attached and detached by moving, it leads degradation of reliability in the daily use of the logging system. Although current syslog protocol which uses UDP as an underlying transport protocol is widely used for network logging, it does not meet this requirement. In order to provide the reliability of network logging, TCP is widely used as the underlying transport protocol of syslog protocol instead of UDP. However, TCP gives adverse affect to the timeliness for important messages and the disconnection of wireless links promotes this problem. In this paper, we propose an efficient log transfer mechanism based on priority queuing and message aggregation technique for reliable logging over wireless networks.

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Language：Japanese   Publisher：Forum on Information Technology  

CiNii Research

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Logs generated by operating systems and application programs provide important information to a network administrator. Logs are used for various purposes including security management, audit, and forensics of intranet. To use logs for such purposes, it is important that logs are reliably retrieved from hosts in the intranet. But the syslog protocol which is widely used for network logging does not meet this requirement. A new syslog protocol is being standardized at the IETF. But this protocol will only supplement the current syslog protocol. The above mentioned requirement of reliable delivery is not addressed. In this paper, we examine the issues and requirements of network logging based on experiments in a real network environment and propose an efficient log transfer method for a next-generation network logging system.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Logs generated by operating systems and application programs provide important information to a network administrator. Logs are used for various purposes including security management, audit, and forensics of intranet. To use logs for such purposes, it is important that logs are reliably retrieved from hosts in the intranet. But the syslog protocol which is widely used for network logging does not meet this requirement. A new syslog protocol is being standardized at the IETF. But this protocol will only supplement the current syslog protocol. The above mentioned requirement of reliable delivery is not addressed. In this paper, we examine the issues and requirements of network logging based on experiments in a real network environment and propose an efficient log transfer method for a next-generation network logging system.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Logs generated by operating systems and application programs provide important information to a network administrator. Logs are used for various purposes including security management, audit, and forensics of intranet. To use logs for such purposes, it is important that logs are reliably retrieved from hosts in the intranet. But the syslog protocol which is widely used for network logging does not meet this requirement. A new syslog protocol is being standardized at the IETF. But this protocol will only supplement the current syslog protocol. The above mentioned requirement of reliable delivery is not addressed. In this paper, we examine the issues and requirements of network logging based on experiments in a real network environment and propose an efficient log transfer method for a next-generation network logging system.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Recently, damages of information leakage caused by illegal use of network applications have been reported. To prevent these damages, a network administrator has identified application and blocked the traffic generated by such application based on TCP port number. Since applications that misrepresent TCP port number have increased, much research attention have been focused on application identification methods utilizing statistical information of network traffic. Although we have proposed a method for identifying application based on similarity of packet payloads during start-up phase of the communication, the method was not efficient for normal traffic. In this paper, we propose a method for generating appropriate templates for efficient application identification. Through the experiments in real network environment, we evaluate that the proposed method can reduce the processing cost while keeping enough identification accuracy.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Recently, damages of information leakage caused by illegal use of network applications have been reported. To prevent these damages, a network administrator has identified application and blocked the traffic generated by such application based on TCP port number. Since applications that misrepresent TCP port number have increased, much research attention have been focused on application identification methods utilizing statistical information of network traffic. Although we have proposed a method for identifying application based on similarity of packet payloads during start-up phase of the communication, the method was not efficient for normal traffic. In this paper, we propose a method for generating appropriate templates for efficient application identification. Through the experiments in real network environment, we evaluate that the proposed method can reduce the processing cost while keeping enough identification accuracy.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Recently, damages of information leakage caused by illegal use of network applications have been reported. To prevent these damages, a network administrator has identified application and blocked the traffic generated by such application based on TCP port number. Since applications that misrepresent TCP port number have increased, much research attention have been focused on application identification methods utilizing statistical information of network traffic. Although we have proposed a method for identifying application based on similarity of packet payloads during start-up phase of the communication, the method was not efficient for normal traffic. In this paper, we propose a method for generating appropriate templates for efficient application identification. Through the experiments in real network environment, we evaluate that the proposed method can reduce the processing cost while keeping enough identification accuracy.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

For taking effective countermeasures against network anomaly events, the classification of detected anomaly events is required. Although the conventional detection method using correlation coefficient histogram can detect the time of occurrence of anomaly events and identify the type of anomalous packets, it is impossible to automatically classify events. In this paper, we define observation features and propose to expand the conventional method by using correlation coefficient value and its probability distribution for the classification of anomaly events. Through experiments using traffic datasets, we show the possibility of classifying network anomaly events.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Internet worms are one of the most serious threats in the Internet. For accurately detecting newly created worms, we have proposed the detection method based on not the common character strings but the similarity analysis of packet and flow payloads. Although the packet-wise analysis enables us to accurately detect worms, the high calculation cost of the analysis needs to be solved. In this paper, we propose an efficient signature generation method for reducing the cost of packet-wise analysis. In addition, we design the multi-stage worm detection system combining the flow-wise and packet-wise analysis for efficiently detecting worms.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Recently, increasing of information leakages caused by illegal use of network applications have been reported. To prevent the occurrence of such incidents, a network administrator should block the traffic exchanged by unauthorized applications by checking incoming and outgoing traffic of his network We have proposed a method for application identification based on transition pattern of payload length. However, that method needs reference vectors of each application for identification. Thus, it cannot identify applications whose reference vectors do not exist. In this paper, to tackle this problem, we propose a method to classify flows of these applications as "Unknown". The proposed method classify flows of these applications by setting threshold of the distance between a vector of the monitored flow and the nearest reference vector. The proposed method can also classify misidentified flows, which is misidentified to another application as "Unknown". In addtion, we evaluate three clustering algorithms: oLVQ1, K-means, and hierarchical clustering and compare their identification performance to find the appropriate clustering algolithm for the proposed method.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Recently, damages of information leakage caused by illegal use of network applications have been reported. To prevent these damages, a network administrator should check incoming and outgoing traffic of his network for blocking the traffic generated by such applications. Therefore, we need a method which quickly identify application without using TCP port numbers, which are easily spoofed. In this paper, we propose a method for identifying application based on similarity of packet payloads during start-up phase of the communication. The proposed method uses a 256 dimensions vector based on the appearance frequencies of 256 character codes. Through experiments using real network traffic, we show efficiency of the proposed method. In addition, we evaluate the technique which can reduce the processing cost with enough identification accuracy.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Sensor networks are expected to be the solution to many applications, such as measuring volcanic activity and monitoring environment pollutants. Such applications do not work well if transmission of sensing data is blocked by malicious nodes. Therefore, we need to detect and eliminate malicious nodes in a sensor network. In this paper, we propose an algorithm to select which sensor nodes should activate their detector agent to be able to have full coverage of all packets in the sensor network.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Recently, a network anomaly detection method focusing correlation coefficients between traffic features has been proposed. This conventional method uses occurrence probability matrices of correlation coefficients for detecting anomalies and identifying anomalous traffic features. However, the conventional method fails to detect anomalous events in the case that the variation of correlation coefficient value is large in normal conditions. For detecting such events, we propose the modification of the conventional method to evaluate the anomalous increase of correlation coefficients value. Through experiments using real traffic data, we show the effectiveness of the proposed method.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

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Language：Japanese   Publisher：Information Processing Society of Japan (IPSJ)  

Recently, information leakage caused by illegal use of network applications(e.g. P2P application) has become a new social issue. To prevent information leakage, early detection and blocking of the traffic exchanged by such applications is strongly required. In this paper, we propose a method for discriminating application of monitored traffic based on the transition pattern of payload-length during start-up phase of the communication. The proposed method does not need port numbers, which are easily spoofed, and can quickly discriminate applications compared with the conventional methods using traffic statistics. Through experiments using real network traffic, we show that the proposed method can quickly and accurately discriminate applications including the P2P application.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Recently, information leakage caused by illegal use of network applications(e.g. P2P application) has become a new social issue. To prevent information leakage, early detection and blocking of the traffic exchanged by such applications is strongly required. In this paper, we propose a method for discriminating application of monitored traffic based on the transition pattern of payload-length during start-up phase of the communication. The proposed method does not need port numbers, which are easily spoofed, and can quickly discriminate applications compared with the conventional methods using traffic statistics. Through experiments using real network traffic, we show that the proposed method can quickly and accurately discriminate applications including the P2P application.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

We propose a method to specify hosts which send anomalous pakects when a notwork anomaly is detected. Our proposed method supposes an anomaly detection technoque based time slot observation. In many cases, the time slot base observation will not extract information to discriminate each host which send packets in each slot. It is difficult to detect true anomalous hosts from multiple hosts sending packets which are the same kind of packets detected as anomaly. Our proposed method reconstructs traffic dump data by eliminating packets of each host which is a candidate of anomalous host, and recalculates an Anomaly Score using ther reconstructed dump data. The proposed method detect true anomalous host based on the recalculated Anomaly Score.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Pulsing Denial-of-Service (DoS) attacks, which can significantly degrade the communication quality (e.g. throughput) of legitimate TCP flows in a stealthy manner, are new serious threat in the Internet. Pulsing DoS attacks The attacker send periodic short bursts of traffic (i.e. pulses) to cause packet losses of TCP flows. To mitigate the effect of this attacks, randomizing retransmission timeout value of TCP is useful. However, such randomizing can degrade the communication quality in the normal situation. In this paper, we propse to change the retransmission timeout value only when the attacks are detected at an intermediate routers. In the proposed method, intermediate routers notice the existence of attacks in a manner similar to Explicit Congestion Notification (ECN). In addition, we also discuss the effect of the attack on SCTP.

CiNii Research

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Research

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Research

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Research

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Research

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Research

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Research

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Language：Japanese   Publisher：Information Processing Society of Japan (IPSJ)  

Pulsing Denial-of-Service (PDoS) attacks seriously degrade the throughput of TCP flow and consequently pose a grave concern to networks. The fact that they generate less traffic than traditional flood-based attacks makes PDoS detection more difficult. Although most of the conventional PDoS detection schemes observe the periodical pattern of the pulse trains, attackers can easily evade the detection system by merely controlling the timing of pulse transmission. The bandwidth usage-based detection scheme, which the authors previously proposed, is robust to the control of attack traffic by attackers. However, the conventional method needs high observation cost because the flow-based traffic analysis is required for reducing false positives. In this paper, we propose a new bandwidth usage-based detection method taking into account the burstiness of traffic which is the principal feature of PDoS attacks. The proposed method can drastically decrease the number of false positives without complicated flow-based traffic analysis. Since the proposed method monitors only aggregated flows, the observation cost is also reduced as compared with the conventional method. Through various simulations, we demonstrate the effectiveness of the proposed method.

CiNii Research

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Language：Japanese  

CiNii Research

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Pulsing Denial-of-Service (PDoS) attacks seriously degrade the throughput of TCP flow and consequently pose a grave concern to networks. The fact that they generate less traffic than traditional flood-based attacks makes PDoS detection more difficult. Although most of the conventional PDoS detection schemes observe the periodical pattern of the pulse trains, attackers can easily evade the detection system by merely controlling the timing of pulse transmission. The bandwidth usage-based detection scheme, which the authors previously proposed, is robust to the control of attack traffic by attackers. However, the conventional method needs high observation cost because the flow-based traffic analysis is required for reducing false positives. In this paper, we propose a new bandwidth usage-based detection method taking into account the burstiness of traffic which is the principal feature of PDoS attacks. The proposed method can drastically decrease the number of false positives without complicated flow-based traffic analysis. Since the proposed method monitors only aggregated flows, the observation cost is also reduced as compared with the conventional method. Through various simulations, we demonstrate the effectiveness of the proposed method.

CiNii Research

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Pulsing Denial-of-Service (PDoS) attacks seriously degrade the throughput of TCP flow and consequently pose a grave concern to networks. The fact that they generate less traffic than traditional flood-based attacks makes PDoS detection more difficult. Although most of the conventional PDoS detection schemes observe the periodical pattern of the pulse trains, attackers can easily evade the detection system by merely controlling the timing of pulse transmission. The bandwidth usage-based detection scheme, which the authors previously proposed, is robust to the control of attack traffic by attackers. However, the conventional method needs high observation cost because the flow-based traffic analysis is required for reducing false positives. In this paper, we propose a new bandwidth usage-based detection method taking into account the burstiness of traffic which is the principal feature of PDoS attacks. The proposed method can drastically decrease the number of false positives without complicated flow-based traffic analysis. Since the proposed method monitors only aggregated flows, the observation cost is also reduced as compared with the conventional method. Through various simulations, we demonstrate the effectiveness of the proposed method.

CiNii Research

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Language：Japanese  

CiNii Research

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Network anomaly detection requires modeling the normal state of the network. When the observation quantities of networks are the mixtures of multiple correlations, correlations between the observed quantities cannot be approximated with a single model. This retards the system's ability in correctly detecting anomaly. In this paper, we propose a novel clustering technique which defines multiple normal states of network by assigning data with different correlations to different clusters. Furthermore, based on the data distribution of the multiple clusters, we also propose a scheme to select both kinds of models - models that use correlations and models that do not. Hence, we succesfully formulate a scheme to dynamically select the model that is most suitable to the prevailing network state. We evaluate the ability the proposed clustering scheme and the model selection scheme in detecting anomalous events and present the results.

CiNii Research

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Denial of Service (DoS) attacks pose a serious threat to the Internet. Mobile networks, which are expected to develop rapidly over a few years, are vulnerable to DoS attacks. In mobile networks, the fact that attackers have the mobility privilage makes the traceback difficult. In this paper we propose a novel and efficient technique to trace the attack route before the attacker enters another network. The proposed scheme uses Time To Live (TTL) values of packets and is capable of tracing the attacker in a short time. Simulation experiments show that the proposed scheme is more efficient in tracing attackers in a mobile environment than conventional approaches.

CiNii Research

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Pulsing Denial-of-Service (PDoS) attacks seriously degrade the throughput of TCP flow and consequently pose a grave concern to networks. The fact that they generate less traffic than traditional flood-based attacks makes PDoS detection more difficult. Most of the conventional PDoS detection schemes observe the periodical pattern of the pulse trains. Thus, attackers can easily escape the detection system by merely controlling the timing of pulse transmission. In addition, if the attack traffic does not path through the observation point of victim network, it is impossible to detect PDoS with conventional PDoS detection schemes. In this paper, we propose a novel and robust PDoS detection scheme. The proposed scheme grasps the bandwidth usage condition from network traffic and make use of the fact that TCP is designed to achieve the maximum bandwidth utilization to distinguish between the congestion due to normal traffic and the congestion due to PDoS. Simulation experiments show that the proposed scheme is effective and robust in detecting PDoS.

CiNii Research

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Research

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Research

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Recently, damages of information systems by worms have been reported at the global level. To control these damages, some automatic signature genenation techniques have been proposed. These techniques use as signature the set of common character strings in the payload of multiple worm flows of the same kind. But these techniques need multiple common character strings for each worm to achieve a high detection rate. Calculation cost is a serious issue for these techniques. In this paper, we propose a novel scheme that does not use common character strings. The proposed scheme uses a 256 dimensions vector based on the appearance frequencies of 256 character codes. This vector is used as a mean to detect worms with low cost. In addition, we construct a cheap worm detection system by using the proposed method as the first stage analysis of conventional Intrusion Detection System (IDS). We evaluate the proposed scheme through experiments and present its performance.

CiNii Research

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Language：Japanese  

CiNii Research

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Security management is a core issue in the current Internet, and illegal accesses is a serious problem in security management. Among various types of illegal accesses, damage caused by Internet worms has become a social problems. For avoiding and mitigating the damage from worms, early detection and appropriate responses depending on the type of worms are required. Although signature-based intrusion detection systems (IDSs) are useful countermeasures for worms, classification result of detected worms may differ for different among IDSs, because signatures are criteria on distinction of the worm type. This can incur confusion on appropriate responses for worms. In this paper, we presents a worm classification system based on the common pieces included in the payload of the same type of worms.

CiNii Research

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

We propose a network traffic modeling method using a histogram of the probabilities of of occurrence of correlation coefficients which are calculated using a pair of observed values of network traffic, and propose a state evaluation method of network traffic using a matrix of the probabilities. This report show that some characteristic matrices can be generated correspond to malicious accesses and types of application, and a prospect of anomaly detection based on the matrix.

CiNii Research

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Research

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

In a network anomaly detection it is necessary to evaluate quantitatively network state. For example, as TCP SYN packets and TCP FIN packets almost have relation one to one in the network traffic, correlations exist. In this paper we propose to define network state by observing sorts of traffics and calculating correlation coefficients between types of packets each time. We think appearance of correlations which would not appear normaly presents anomaly state in the network. Through experiments using real network traffic data we report about the results.

CiNii Research

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

For Traffic pattern based traceback techniques, non-DoS traffic included in DoS traffic becomes a source of noise which results in the reduction of traceback accuracy. During the Flooding DoS attack, lower bounds of traffic volume of links on a attack path is larger than the rate of attack traffic during the attack. In this paper, we propose a traffic pattern filtering method based on lower bounds of traffic volume for improving DDoS traceback accuracy and using original patterns and filtered patterns for traceback. We evaluate the traceback accuracy of the proposed method by the simulation using traffic obtained from a real network.

CiNii Research

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Owing to the excessive amount of damage they are causing, epidemic worms have become a social problem. Recent researches have pointed out that epidemic worms propagate similar payloads. The authors have shown in previous researches that it is possible to evaluate similarities between these payloads by a 256 dimensions vector based on histograms of the appearance frequencies of 256 character codes. We have confirmed this through our earlier researches. However, this method, if applied to flows from only one network, is prone to false positives in cases such as normal emails that are sent through mailing lists. To overcome such problems, we propose a new scheme which checks for any similarity between flows detected at several IDSs in a distributed environment. The proposed scheme is based on the fact that normal payloads propagating from different networks are different, whereas in case of epidemic worms similar payloads are generated from several networks. Through experiments using real network traffic that contains worms, we present the effectiveness of the proposed scheme.

CiNii Research

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

The explosive growth of the Internet has increasingly given rise to better sophisticated and larger number of intrusions. Hence, necessity of anomaly-based Intrusion Detection Systems (IDSs) which are capable of detecting novel attacks, is increasingly being felt. Even in anomaly-based detections, it is possible to observe traffic by several approaches. Among them, flow-based detection which uses a series of packets exchanges between two terminals as a unit of observation has an advantage of being able to detect anomaly that is present only in some specific sessions. However, in large-scale networks where a large number of communication takes place, analyzing every flow is not practical. In this paper, we propose an anomaly detection method which is based on multi stage traffic analysis. The proposed method analyzes traffic in slots of fixed length and narrows down the number of flows which need to be subjected to detection. Through experiments using datasets, we present the effectiveness of the proposed method.

CiNii Research

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Research

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

In DRDoS attacks, which are threat in today's Internet, the attacker attacks the target host with response packets from legitimate hosts in reply to the attacker's request packet. Since the number of attack packetsis large, the recognition of attack is simple. However in a DoS situation mspecting all the packets in detail is not. realistic, therefore identification and filtering of attack packets are challenging tasks. In this paper, a method for detecting DRDoS attacks, based on verification of response packets with bidirectional packet confirmation, is proposed. The proposed method makes detection system scalable by generating response packet candidates at the time of sending the request packet in advance. We evaluate the detection performance and scalability of this method through some experiments.

CiNii Research

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

In DRDoS attacks, which are threat in today's Internet, the attacker attacks the target host with response packets from legitimate hosts in reply to the attacker's request packet. Since the number of attack packetsis large, the recognition of attack is simple. However in a DoS situation mspecting all the packets in detail is not. realistic, therefore identification and filtering of attack packets are challenging tasks. In this paper, a method for detecting DRDoS attacks, based on verification of response packets with bidirectional packet confirmation, is proposed. The proposed method makes detection system scalable by generating response packet candidates at the time of sending the request packet in advance. We evaluate the detection performance and scalability of this method through some experiments.

CiNii Research

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

In DRDoS attacks, which are threat in today's Internet, the attacker attacks the target host with response packets from legitimate hosts in reply to the attacker's request packet. Since the number of attack packetsis large, the recognition of attack is simple. However in a DoS situation mspecting all the packets in detail is not. realistic, therefore identification and filtering of attack packets are challenging tasks. In this paper, a method for detecting DRDoS attacks, based on verification of response packets with bidirectional packet confirmation, is proposed. The proposed method makes detection system scalable by generating response packet candidates at the time of sending the request packet in advance. We evaluate the detection performance and scalability of this method through some experiments.

CiNii Research

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Research

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Language：English   Publisher：The Institute of Electronics, Information and Communication Engineers  

Since LEO(Low Earth Orbit) satellites move relative to Earth, handovers are required from time to time. Some LEO satellite networks have satellites orbiting in two different direction. One from north to south and one from south to north. Communication between satellites orbiting in different directions can take place only through the polar region. Therefore when terminals are connected to satellites orbiting in different directions propagation delay is longer than when they are connected to satellites orbiting in the same direction. Usually two satellites can be seen by a ground terminal, o...

CiNii Research

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Language：English   Publisher：The Institute of Electronics, Information and Communication Engineers  

Since LEO(Low Earth Orbit) satellites move relative to Earth, handovers are required from time to time. Some LEO satellite networks have satellites orbiting in two different direction. One from north to south and one from south to north. Communication between satellites orbiting in different directions can take place only through the polar region. Therefore when terminals are connected to satellites orbiting in different directions propagation delay is longer than when they are connected to satellites orbiting in the same direction. Usually two satellites can be seen by a ground terminal, one satellite orbiting in each direction. Conventional service satellite selection method, select the satellite which has the highest angle of elevation to handover a terminal, which can result in two communicating terminal getting connected to satellites orbiting in different directions. In the case of handover between satellites orbiting in different directions the degradation of communication quality is higher due to the drastic change in delay. In this paper we propose a satellite selection method to connect communicating terminals to satellites orbiting in the same direction, using geographical location information of the communicating terminals. We show through simulation that the proposed method reduce the delay and jitter, number of hops required for communication as well as congestion in polar region links.

CiNii Research

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Mobility management is one of the problems on LEO (Low Earth Orbit) IP satellite network. In mobility management, a binding between unique name of a node and position in a network of the node is needed. In IP network, binding update is required when handover is occured, because IP address which indicates the position in a network of the node changes with handover. In LEO satellite network, however concentrated handover are caused by fast movement of satellites. So, existing mobility management schemes are not suitable for LEO network, because control traffic when binding update also occurs intensively. In this paper, we propose new mobility management scheme that separates binding update from handover by using geographical information of the node. And then we evaluate proposed scheme and show the validity.

CiNii Research

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Mobility management is one of the problems on LEO (Low Earth Orbit) IP satellite network. In mobility management, a binding between unique name of a node and position in a network of the node is needed. In IP network, binding update is required when handover is occured, because IP address which indicates the position in a network of the node changes with handover. In LEO satellite network, however concentrated handover are caused by fast movement of satellites. So, existing mobility management schemes are not suitable for LEO network, because control traffic when binding update also occurs intensively. In this paper, we propose new mobility management scheme that separates binding update from handover by using geographical information of the node. And then we evaluate proposed scheme and show the validity.

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CiNii Research

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Recently, much research attention has been focused on LEO satellite networks connected to ISL(Inter Satellite Link).A global network, covering the whole earth, can be developed if wireless and wired networks are seamlessly by TCP/IP protocol.However, being originally designed for wired networks, the implementation of TCP/IP on LEO satellite networks may give rise to some difficulties, such as dynamic propagation delay caused by handover and re-routing.In this paper, we propose enhanced TCP congestion control mechanism for LEO satellite network.Our proposal aims to attenuate handover problem with the use of IP header's TTL field.Our simulation results show how effective our mechanism is avoiding unnecessary fast retransmit and decreasing congestion.

CiNii Research

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Recently, attention to LEO(Low Earth Orbit)satellite network which is connected to ISL(Inter Satellite Link)is being increased. Building global network which covers the whole earth is possible if seamless connection between present ground network and LEO satellite network by using TCP / IP is possible. However, TCP / IP is originally designed for ground network. Consequently, various problems are expected on LEO satellite network. In this paper, we examine TCP / IP communication which is applied to LEO satellite network. Through this, we clarified that unnecessary fast retransmission occurs by handover during communication. Furthermore, we propose how to control this unnecessary retransmission by adding few changes to the end terminal using TTL field of IP header. In addition, we evaluate proposed model by simulation. Finally, we show possiblity of congestion control by combining RTT measuring with TTL field information.

CiNii Research

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Recently, attention to LEO(Low Earth Orbit) satellite network which is connected to ISL(Inter Satellite Link) is being increased. Building global network which covers the whole earth is possible if seamless connection between present ground network and LEO satellite network by using TCP/IP is possible. However, TCP/IP is originally designed for ground network. Consequently, various problems are expected on LEO satellite network. In this paper, we examine TCP/IP communication which is applied to LEO satellite network. Through this, we clarified that unnecessary fast retransmission occurs by handover during communiction. Furthermore, we propose how to control this unnecessary retransmission by adding few changes to the end terminal using TTL field of IP header. In addition, we evaluate proposed model by simulation. Finally, we show possiblity of congestion control by combining RTT measuring with TTL field information.

CiNii Research

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Recently, attention to LEO(Low Earth Orbit)satellite network which is connected to ISL(Inter Satellite Link)is being increased. Building global network which covers the whole earth is possible if seamless connection between present ground network and LEO satellite network by using TCP/IP is possible. However, TCP/IP is originally designed for ground network. Consequently, various problems are expected on LEO satellite network. In this paper, we examine TCP/IP communication which is applied to LEO satellite network. Through this, we clarified that unnecessary fast retransmission occurs by handover during communiction. Furthermore, we propose how to control this unnecessary retransmission by adding few changes to the end terminal using TTL field IP of header. In addition, we evaluate proposed model by simulation. Finally, we show possiblity of congestion control by combining RTT measuring with TTL field information.

CiNii Research

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Event date： 2025.3

Language：Japanese   Presentation type：Poster presentation  

Venue：東北学院大学五橋キャンパス  

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Event date： 2025.3

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Venue：東北学院大学五橋キャンパス  

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Event date： 2025.3

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Venue：東北学院大学五橋キャンパス  

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Event date： 2024.8

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Venue：とりぎん文化会館／オンライン  

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Event date： 2024.3

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Venue：日本大学工学部  

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Event date： 2024.3

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Event date： 2024.3

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Venue：日本大学工学部  

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Event date： 2023.11

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Venue：愛媛県男女共同参画センター  

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Event date： 2023.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名古屋大学 東山キャンパス  

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Event date： 2023.3

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Event date： 2022.9

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Event date： 2021.8

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Applicant：国立大学法人東北大学

Application no：JP2006322236  Date applied：2006.11

Announcement no：WO2007-055222  Date announced：2007.5

J-GLOBAL

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Applicant：国立大学法人東北大学

Application no：特願2005-258812  Date applied：2005.9

Announcement no：特開2007-074339  Date announced：2007.3

J-GLOBAL

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Applicant：国立大学法人東北大学

Application no：特願2005-257789  Date applied：2005.9

Announcement no：特開2007-074219  Date announced：2007.3

J-GLOBAL

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Applicant：国立大学法人東北大学

Application no：特願2005-242479  Date applied：2005.8

Announcement no：特開2007-060233  Date announced：2007.3

J-GLOBAL

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Award type：Award from Japanese society, conference, symposium, etc. 

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Award type：Award from international society, conference, symposium, etc. 

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Audience： Company

Type：Lecture

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Type：Other

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Audience： College students,　Graduate students

Type：Seminar, workshop

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