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An alternative to using CRLs is the certificate validation protocol known as Online Certificate Status Protocol (OCSP). OCSP has the primary benefit of requiring less network bandwidth, enabling real-time and near real-time status checks for high volume or high-value operations.
Since an OCSP response has less data to parse, the client-side libraries that handle it can be less complex than those that handle CRLs. [11] OCSP discloses to the responder that a particular network host used a particular certificate at a particular time. OCSP does not mandate encryption, so other parties may intercept this information. [2]
OCSP stapling can solve the operational challenges of OCSP, namely additional network requests causing latency and privacy degradation. [33] However, it can be susceptible to downgrade attacks by an on-path attacker. [9] RFC 7633 defines an extension that embeds a requirement into a certificate to be stapled to a valid OCSP response. [34]
OCSP stapling is designed to reduce the cost of an OCSP validation, both for the client and the OCSP responder, especially for large sites serving many simultaneous users. However, OCSP stapling supports only one OCSP response at a time, which is insufficient for certificate chains with intermediate CA certs. [26] [27]
The revocation status is checked, whether by CRL, OCSP, or some other mechanism, to ensure the certificate is not revoked; The issuer name is checked to ensure that it equals the subject name of the previous certificate in the path;
It must be continuously updated with current CRL information from a certificate authority which issued the certificates contained within the CRL. While this is a potentially labor-intensive process, the use of a dedicated validation authority allows for dynamic validation of certificates issued by an offline root certificate authority .
X.509 and RFC 5280 also include standards for certificate revocation list (CRL) implementations. Another IETF-approved way of checking a certificate's validity is the Online Certificate Status Protocol (OCSP). Firefox 3.0 enabled OCSP checking by default, as did versions of Windows from at least Vista and later. [9]
Their use doesn't involve the problems of trusting third parties that may improperly sign certificates. Self-signed certificate transactions usually present a far smaller attack surface by eliminating both the complex certificate chain validation, [1] and certificate revocation checks like CRL and OCSP.
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