Software Security Theories and Systems : Second Mext NSF JSPS International Symposium ISSS 2003 Tokyo Japan November 4 6 2003. Revised Papers This book constitutes the thoroughly refereed post proceedings of the Second Mext NSF JSPS Interntional Symposium on Software Security ISSS 2003 held in Tokyo Japan in November 2003. The 18 revised full invited and selected papers presented were carefully reviewed and improved for inclusion in the book. The papers are organized in topical sections on analysis of protocols and cryptography verification of security properties safe implementation of programming languages secure execution environments and secure systems and security management