Digital Certificate Operation in a Complex Environment
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X.509 ITU-T recommendation specifiying aspects of digital certificates and PKI ITU-T Recommendation X.509 specifies the authentication service for X.500 directories, as well as the widely adopted X.509 certificate syntax. The initial version of X.509 was published in 1988, version 2 was published in 1993, and version 3 was proposed in 1994 and considered for approval in 1995. Version 3 addresses some of the security concerns and limited flexibility that were issues in versions 1 and 2.
http://www.ietf.org/rfc/rfc2459.txt
Oxford University Computing Services Mimas Athens access management services Oxfore e-Science Centre Systems and Electronic Resources Service Joint Information Systems Committee