1Günther Horn,Bart Preneel,Authentication and Payment in Future Mobile Systems,Proceedings of the 5th European Symposium on Research in Computer Security,P.277-293,September 16-18,1998
2ITU-T Recommendation X.509-ISO/IEC 9594-8.Information Technology-Open Systems InterconnectionThe Directory:Public-Key and Attribute Certificate Frameworks.4th edition,2001