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Invalidity Date This noncritical extension contains a date/time value showing when a suspected or known compromise of the private key occurred.
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The following CRL extensions have been defined on a per-CRL basis:
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Authority Key Identifier This extension can be used to differentiate between multiple CRL signing keys held by this CA. This field contains a unique key identifier (the subject key identifier in the CRL signer s certificate). The use of this field is mandated by RFC2459. Issuer Alternative Name This extension associates one or more alternative name forms with the CRL issuer. RFC2459 specifies that if no DN is specified in the subject field of a certificate, it must have one or more alternative names, and this extension must be flagged critical. RFC2459 recommends the use of this extension when alternative name forms are available but mandates that it not be marked critical. CRL Number This noncritical extension provides a means of easily recognizing whether a given CRL has been superseded. It contains a unique serial number relative to the issuer of this CRL. Although this extension is noncritical, RFC2459 mandates its use. Delta CRL Indicator This critical extension identifies the CRL as a delta CRL and not a base CRL (see later section, Delta CRLs ). If this extension is present, RFC2459 mandates that it be marked critical. Issuing Distribution Point This critical extension identifies the name of the CRL distribution point for a given CRL (see next section). It also indicates whether the CRL covers revocation of end user certificates only or of CA certificates only, and it specifies whether the certificate was revoked for a set reason. This extension can also be used to indicate that the CRL is an indirect CRL. If this extension is present, RFC2459 mandates that it be marked critical.
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What happens when the CRL for a given PKI domain becomes too large CRL distribution points (sometimes referred to as CRL partitions) provide a simple solution. The idea is that instead of a single large CRL, several
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smaller CRLs are created for distribution. Relying servers retrieve and process these smaller CRLs more easily, saving time, money, and bandwidth. To use CRL distribution points, the CA supplies a pointer to a location within the Issuing Distribution Point extension. Examples of such pointers are a DNS name, an IP address, or the specific filename on a Web server. The pointer enables relying parties to locate the CRL distribution point.
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Delta CRLs
A delta CRL lists only incremental changes that have occurred since the preceding CRL. In this way, delta CRLs provide a way to significantly improve processing time for applications that store revocation information in a format other than the CRL structure. With this approach, such applications can add new changes to their local database while ignoring unchanged information already stored there. After an initial full CRL (base CRL) posting, an accurate list of revoked certificates is maintained through delta CRLs. As a result, delta CRLs can be issued much more often than can base CRLs. CAs use the Delta CRL Indicator extension to indicate the use of delta CRLs. In addition, a special value, the Remove from CRL value, can be used in the Reason Code extension to specify that an entry in the base CRL may now be removed. An entry might be removed because certificate validity has expired or the certificate is no longer suspended.
Indirect CRLs
Indirect CRLs are another alternative for improving the distribution of CRLs. As the name implies, an indirect CRL is provided to the relying party by a third party that did not necessarily issue the certificate. In this way, CRLs that otherwise would be supplied by numerous CAs (or other revoking authorities) can be consolidated into a single CRL for distribution. For example, suppose that a private PKI is served by multiple CAs. By using indirect CRLs, the PKI can receive one CRL issued by one CA (or other trusted third party) on behalf of the other CAs. Two CRL extensions enable the use of indirect CRLs. To indicate that a CRL contains revocation information from multiple CAs, the Indirect CRL attribute is set to True. It s also important to provide the relying party with additional information concerning revocation of each entry. A CRL entry for each certificate is used to identify its CA. If there is no CRL entry, the certificate is assumed to have been issued by the CA listed on the first line of the CRL.
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