Program Co-Chair, International Conference on Convergence and Hybrid Information Technology (ICHIT 2011), Springer-Verlag Lecture Notes in Computer Science, Volume 6935, September 22-24 , 2011, Daejeon, Korea.
Track Vice Chair, Track of Security and Trustworthy Computing, IEEE 17th International Conference on Parallel and Distributed Systems (ICPADS 2011)
Program Committee member, The 11th International Workshop on Information Security Applications (WISA 2010)
Program Committee member, Security and trustworthy Computing Track, The 5th International Conference on Frontier of Computer Science and Technology (FCST 2010)
Program Committee member, The first Asia-Pacific Workshop on Cyber Security (APWCS 2010)
Program Committee member, Track 4. Security in Internet Symposium, The 2nd International Conference on Internet (ICONI 2010).
1997 ~ 2009:
Guest Associate Editors, IEICE 2009 Special Section on Information and Communication System Security.
Program Committee member, Security for CE Communications Track, The 6th Annual IEEE Consumer Communications and Networking Conference (CCNC) (2009)
Program Committee member & Section Chair (B12 Section and Keynote Speech C), The Fifth International Conference on Information Assurance and Security (IAS09)
Program Committee member, The 4th International Workshop on Security (IWSEC2009)
Program Committee member, The Workshop on Information Security Applications (WISA2009)
Program Committee member, 2009 Joint Workshop on Information Security (JWIS2009).
Chair of Keynote Speech II, Information Security Conference (ISC08)
2004年RSA Conference Cryptographers Track (CT-RSA 04)議程委員及Track Moderator 。