This book constitutes the refereed proceedings of the 7th International Workshop on Information Security Applications, WISA 2006, held in Jeju Island, Korea in August 2006.

The 30 revised full papers presented were carefully selected during two rounds of reviewing and improvement from 146 submissions. The papers are organized in topical sections on public key crypto applications and virus protection, cyber indication and intrusion detection, biometrics and security trust management, secure software and systems, smart cards and secure hardware, mobile security, DRM, information hiding, ubiquitous computing security, P2P security, pre-authentication for fast handoff in wireless mesh networks including mobile APs.