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Since an OCSP response contains less data than a typical certificate revocation list (CRL), it puts less burden on network and client resources. [10]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.
As of Firefox 28, Mozilla has announced they are deprecating CRL in favour of OCSP. [4] CRL files may grow quite large over time e.g. in US government, for certain institution multiple megabytes. Therefore, incremental CRLs have been designed [14] sometimes referred to as "delta CRLs". However, only a few clients implement them. [15]
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.
The Online Certificate Status Protocol (OCSP) allows clients to interactively ask a server (an OCSP responder) about a certificate's status, receiving a response that is cryptographically authenticated by the issuing CA. [29] It was designed to address issues with CRLs. [30] A typical OCSP response is less than 1 kB. [31]
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.
A drawback to offline operation is that hosting of a certificate revocation list by the root CA is not possible (as it is unable to respond to CRL requests via protocols such as HTTP, LDAP or OCSP). However, it is possible to move certificate validation functionality into a dedicated validation authority authorized by the offline root CA.
OCSP CRL SASL OTR Direct Client-to-Client (DCC) support. The Direct Client-to-Client Protocol (DCC) has been the primary method of establishing connections directly ...