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The ANSI X.509 digital certificate
standard grew out of discussions in the late 1980s. Augmented
by further work on the Privacy Enhanced Mail (PEM) standard in the early
1990s, X.509v3 is the current industry standard for digital
certificate formats. The second version of X.509 added serial
numbers to uniquely certificate authority and the subscriber. The latest
version of this standard, X.509 version 3, adds extended attribute fields
so that certificates can convey additional information such as security
X.509 also includes standards for
certificate revocation, with the current version of the CRL standard
being X.509v2. Version 2 of the CRL standard allows for extensions
(like the V3 certificate), standard extensions such as reason code/suspension/etc.,
CRL distribution points (improves scalability for large CRLs by
allowing multiple sites to distribute portions of the list), and a Delta
CRL containing only the incremental changes in the CRL.
X.509v3 is the current industry standard for Digital Certificates. It is similar to the X.509v2 certificate standard, but allows for extension of the contents of the certificate.
The current ANSI standard for the format of a Certificate Revocation List (CRL) is X.509v2.
ANSIs X9F1 project includes work on other cryptography-related standards for the Financial Services Industry, including algorithms such as DSA, SHA, RSA, 3DES, Diffie-Hellman, certificate management, etc.
An earlier ANSI standard, X.500, specifies the hierarchical format for Distinguished Names, which are often used on digital certificates.
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CertiGuide for Security+ (http://www.CertiGuide.com/secplus/) on CertiGuide.com
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