參考文獻
[1] Housley, R., Ford, W., Polk, W. and D. Solo, “Internet X.509 Public Key Infrastructure, Certificate and CRL Profile”, RFC 2459,January 1999.
[2] C. Adams, BBN, D. Pinkas, Integris, R. Zuccherato, Entrust, “Internet X.509 Public Key Infrastructure Time-Stamp Protocol (TSP) “, RFC 3161,August 2001
[3] Digital Signature Standard. FIPS Pub 186. National Institute of Standards and Technology. 19 May 1994.
[4] Hoffman, P., “Enhanced Security Services for S/MIME”, RFC 2634,June 1999.
[5] ISO/IEC 10181-5: Security Frameworks in Open Systems. Non-Repudiation Framework. April 1997.
[6] Rivest, R., “The MD5 Message-Digest Algorithm”, RFC 1321,April 1992.
[7] Secure Hash Standard. FIPS Pub 180-1. National Institute of Standards and Technology. 17 April 1995.
[8] “Information-Information technology - Securitytechniques- Time-stampings Service”.ISO/IEC 18014, 1 October 2002.