Trust Issues in PGP and Solutions

[1] Pretty good privacy user-s guide .Distributed with the PGP Software, Version 7.0, 2001 [2] An introduction of cryptography .Distributed with the PGP Software, Version 7.0, 2001 [3] Philip R Zimmermann. The official PGP user's Guide[M]. Cambridge:MIT Press, 1995 [4] Feigenbaum J, Blaze M, Lacy J. Decentralized trust management . In:Proceedings of the IEEE Conference on Security and Privacy . Oakland:IEEE,1996. 164~173 [5] ITU-T recommendation X.509 (1997 E):Information technology-open systems interconnection-the Directory:authentication framework[S],1997 [6] Myers M, Ankney R, Malpani A. RFC 2560, X.509 Internet public key infrastructure online certificate status protocol-OCSP[S],1999