This book constitutes the refereed proceedings of the 5th International Conference on Information Security ISC 2002, held in Sao Paulo, Brazil, in September/October 2002. The 38 revised full papers presented were carefully reviewed and selected from 81 submissions. The papers are organized in topical sections on intrusion detection and tamper resistance, cryptographic algorithms and attack implementation, access control and trust management, authentication and privacy, e-commerce protocols, signature schemes, cryptography, key management, and security analysis.