Editorial Secretary

    International Journal of Information Security, IJIS, Springer-Verlag
    IJIS (SpringerLink)

    IEICE Trans. on Fundamentals
    Special Section on Cryptography and Information Security, 1997, 2001, 2002.

    IPSJ Journal
    Special Issue on Research on Computer Security Proping up Ubiquitous Society, August 2006.
    Special Issue on Reconsidering Computer Security Technology for Information Systems, September 2007.

Guest Editor & Guest Associate Editor & Examiner

    Guest Editor
    International Journal of Wireless and Mobile Computing, IJWMC, Inderscience Publishers,
    Special Issue on Security of Computer Network and Mobile Systems, Issue 1, 2006.

    Guest Editor
    Journal of Universal Computer Science, JUCS,
    Special Issue on Cryptography in Computer System Security,
    Vol.14, No.3, 2008.

    Guest Associate Editor
    IEICE Trans. on Fundamentals
    Special Section on Cryptography and Information Security, 2003, 2004, 2005.
    Special Section on Discrete Mathematics and Its Applications, 2007.
    IEICE Trans. A 電子情報通信学会和文A
    小特集号「マルチメディア情報ハイディング技術とその応用」 2010年2月号.

    Examiner
    IPSJ Journal
    Editorial Committee, Network Subgroup 2005.6-2009.5 (Deputy Chief Examiner 2007, Chief Examiner 2008).
    Sepcial Issue 「安心・安全な社会基盤を実現するコンピュータセキュリティ技術」, September 2008.
    Sepcial Issue 「社会を活性化するコンピュータセキュリティ技術」, September 2009.
    Speical Issue 「多様なネットワークサービスの統合・連携に向けたインターネットと運用管理技術」, March 2010.
    Speical Issue 「マルチメディア、分散、協調とモバイルシステム」, March 2010.
    Sepcial Issue 「人と組織の社会貢献を支えるコンピュータセキュリティ技術」, September 2010.
    Special Issue　「人と共存するコンピュータセキュリティ技術」, September 2011.

Steering Committee Member of International Conference

    ISC (Information Security Conference):
    ISW 1997 1999 2000 ISC 2001 2002 2003 2004 2005 2006 2007
    Date: Sept. 17-19 Nov. 6-7 Dec. 20-21 Oct. 1-3 Sept. 30- Oct. 2 Oct. 1-3 Sept. 27-29 Sept. 20-23 Aug. 30- Sept. 2 Oct. 9-12
    City: Tatsunokuchi Kuala Lumpur Wollongong Malaga Sao Paulo Bristol Palo Alto Singapore Samos Valparaiso
    Country: Japan Malaysia Australia Spain Brazil UK USA Singapore Greece Chile
    Proceedings: LNCS 1396 1729 1975 2200 2433 2851 3225 3650 4176 4779
    ISC 2008 2009 2010 -
    Date: Sept. 15-18 Sept. 7-9 Oct. 25-28 -
    City: Taipei Pisa Boca Raton -
    Country: Taiwan Italy USA -
    Proceedings: LNCS 5222 5735 Post-proceedings -
    UASS 2007 (2nd International Workshop on Ubiquitous Application & Security Service) in ICCSA 2007 (The International Conference on Computational Science and Its Application)

Organizing Committee Member of International Conference

    APSCC (Asia-Pacific Services Computing Conference) 2007: Local arrangement
    Asiacrypt 2000: Local member, 2009: Secretary
    ISC (Information Security Conference) 2007: General co-chair
    ISW 1997: Organizing committee chair
    IWSEC (International Workshop on Security) 2006, 2007: Publication, 2009
    Pairing (International Conference on Pairing-based Cryptography) 2007: Publication, etc.

Program Committee Member of International Conferences

    ACISP (Australasian Conference on Information Security and Privacy) 2001.
    APSIPA ASC (Information and Network Security Track of the Annual Summit and Conference of Asia-Pacific Signal and Information Processing Association) 2010
    APSCC (Asia-Pacific Services Computing Conference) 2007, 2008, 2009.
    APWCS (Asia-Pacific Workshop on Cyber Security) 2010 (PC co-chair) (in conjunction with NSS 2010)
    Asiacrypt 2002.
    AsiaCCS (ACM Symposium on InformAtion, Computer and Communications Security) 2007.
    CNIS (IASTED International Conference on Communication, Network, and Information Security) 2006, 2007.
    CRITIS (International Workshop on Critical Information Infrastructures Security) 2006.
    ISPEC (Information Security Practice and Experience Conference) 2005, 2006, 2008, 2010.
    ICICS (International Conference on Information and Communications Security) 2002, 2004.
    ICISC (International Conference on Information Security and Cryptology) 2000, 2003, 2004, 2005, 2006, 2007.
    Infrastructure Security Conference 2002.
    Inscrypt (SKLOIS Conference on Information Security and Cryptology) 2006, 2007, 2009, 2010.
    ISC (Information Security Conference) 2001, 2005, 2006.
    ISW (Information Security Workshop) 1999 (PC co-chair), 2000.
    IWSEC（International Workshop on Security） 2006, 2007, 2009 (PC co-chair).
    MCIS (Mexican Conference on Informatics Security) 2006.
    RFIDsec Asia (Workshop on RFID Security) 2010 2011.
    SESYS (Security Systems) 2006 in ICSNC (International Conference on Systems and Networks Communications) 2006.
    NSS (International Workshop on Network and System Security) 2007, 2008, 2009.
    New Security Paradigms Workshop 1998.
    SecureComm (International ICST Conference on Security and Privacy in Communication Networks) 2010.
    SecTech (International Conference on Security Technology) 2009.
    SECURWARE (International Conference on Emerging Security Information, Systems and Technologies) 2007, 2008, 2009.
    SECRYPT (International Conference on Security and Cryptography) 2010.
    SeqUbiq (International Workshop on Security in Ubiquitous Computing Systems) 2006.
    SSNDS (IEEE International Symposium on Security in Networks and Distributed Systems) 2007.
    SNDS (International Workshop on Security in Network and Distributed Systems) 2006.
    Trustbus (Trust and privacy in digital business) 2002, 2003, 2004 in conjunction with DEXA (International Conference on Database and Expert Systems Applications) 2002.
    WISA (International Workshop on Information Security Applications) 2007, 2009, 2010.