The following fields of the X.509 version 2 CRL format are used by the CAs:

Field

Description

version

Set to v2

Signature

Identifier of the algorithm used to sign the CRL

Issuer

The full Distinguished Name of the CA issuing the CRL

This update

Time of CRL issuance

Next update

Time of next expected CRL update

Revoked certificates

List of revoked Certificate information

Version Numbers

No stipulation.

CRL Entry Extensions

CRLs issued support the Authority Key Identifier, crlNumber, invalidityDate, and expiredCertsOnCRL extensions.