Dealing with security issues, the book is divided into sections covering the eleven core information security technologies, including topics related to applications, and issues related to application development and deployment: + Security Protocol; + Smart Card; + Network Security and Intrusion Detection; + Trusted Platform; + eSociety; + TTP Management and PKI; + Secure Workflow Environment; + Secure Group Communications; + Risk Management + Security Policy; + Trusted System Design and Management. This book consists of proceedings of the 16th International Conference on Information Security (Sec'01), sponsored by the International Federation for Information Processing (IFIP) and organized by IFIP Technical Committee 11.