The 6th International Workshop on Information Security Applications (WISA 2005) was held on Jeju Island, Korea, during August 22-24, 2005. The workshop was sponsored by the Korea Institute of Information Security and Cryptology (KIISC), the Electronics and Telecommunications Research Institute (ETRI) and the Ministry of Information and Communication (MIC). The aim of the workshop is to serve as a forum for new conceptual and - perimental research results in the area of information security applications, with contributions from the academic community as well as from industry. The wo- shop program covers a wide range of security aspects including network security, e-commerce, cryptography, cryptanalysis, applications and implementation - pects. TheProgramCommitteereceived168papersfrom17countries,andaccepted 29 papers for a full presentation track and 16 papers for a short presentation track. Each paper was carefully evaluated through a peer-review process by at least three members of the Program Committee. This volume contains revised versionsof29papersacceptedandpresentedinthefullpresentationtrack.Short papersonlyappearedintheWISA2005pre-proceedingsaspreliminaryversions, and their extended versions may be published elsewhere.
In addition to the contributed papers, the workshop had ?ve special talks. Moti Yung gave a tutorial talk, entitled "Malware Meets Cryptography." Virgil Gligor and Michel Abdalla gave invited talks in the full presentation track, en- tled "On the Evolution of Adversary Models in Security Protocols" and "Public- Key Encryption with Keyword Search," respectively. Finally, Shozo Naito and Jonguk Choi gave invited talks in the short presentation track, entitled "New RSA-Type Public-Key Cryptosystem and Its Performance Evaluation" and "A New Booming Era of DRM: Applications and Extending Business," respectively.