This book constitutes the refereed proceedings of the 7th International Conference on Information and Communications Security, ICICS 2005, held in Beijing, China in December 2005.

The 40 revised full papers presented were carefully reviewed and selected from 235 submissions. The papers are organized in topical sections on fair exchange, digital signatures, cryptographic protocols, cryptanalysis, network security, applied cryptography, key management, access control, applications, watermarking, and system security.