This book constitutes the refereed proceedings of the 8th International Conference on Information and Communications Security, ICICS 2006, held in Raleigh, NC, USA in December 2006.The 22 revised full papers and 17 revised short papers presented were carefully reviewed and selected from 119 submissions. The papers are organized in topical sections on security protocols, applied cryptography, access control and systems security, privacy and malicious code, network security, systems security, cryptanalysis, applied cryptography and network security, as well as security implementations.