At the time a digital certificate is created it is assigned an expiration date, which appears in the certificate itself. A new certificate must be created by the time the previous certificate expires.
Expiration is different from revocation; because the expiration date is known in advance, and no notification of the CA is required (expiration occurs automatically at the end of the period of validity).
The expiration date is usually assigned by the CA, according to its policies on the length of time a certificate is considered valid. Normally this period does not exceed a year or two.
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CertiGuide for Security+ (http://www.CertiGuide.com/secplus/) on CertiGuide.com
Version 1.0 - Version Date: November 15, 2004
Adapted with permission from a work created by Tcat Houser et al.
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