E status ignored does not require updating
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Abstract Microsoft Windows 2000 and Microsoft Windows XP offer significant features in the areas of X.509 support, PKI as well as certificate status checking and revocation.This White paper details the basics of certificate status, chain building, and how they work in Windows operating systems to assist administrators in troubleshooting a PKI implementation.
Traditionally a PKI uses a distributed method of verification so that the clients do not have to contact the Certification Authority (CA) directly to validate the credentials presented.Without checking certificates for revocation, the possibility exists that a security principal will accept credentials that have been revoked by a CA administrator.Certificates are issued with a planned lifetime and explicit expiration date.A certificate may be issued for one minute, thirty years or even more.Once issued, a certificate becomes valid once its validity time has been reached, and it is considered valid until its expiration date.However, various circumstances may cause a certificate to become invalid prior to the expiration of the validity period.
Such circumstances include change of name, change of association between subject and CA (for example, when an employee terminates employment with an organization), and compromise or suspected compromise of the corresponding private key.
Under such circumstances, the CA needs to revoke the certificate.
There are several mechanisms to represent revocation information; RFC 2459 defines one such method.
This method involves each CA periodically issuing a signed data structure called a certificate revocation list (CRL).
A CRL is a time stamped list identifying revoked certificates, which is signed by a CA and made freely available in a public repository.
Each revoked certificate is identified in a CRL by its certificate serial number.