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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 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. As of Firefox 28, Mozilla has announced they are deprecating CRL in favour of OCSP.
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 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]
To reduce the amount of network traffic required for certificate validation, the OCSP protocol may be used instead. While a validation authority is capable of responding to a network-based request for a CRL, it lacks the ability to issue or revoke certificates.
XiPKI, [36] CA and OCSP responder. With SHA-3 support, implemented in Java. (Apache licensed) XCA [37] is a graphical interface, and database. XCA uses OpenSSL for the underlying PKI operations. DogTag is a full featured CA developed and maintained as part of the Fedora Project.
Self-contained messages with protection independent of transfer mechanism – as opposed to related protocols EST and SCEP, this supports end-to-end security.; Full certificate life-cycle support: an end entity can utilize CMP to obtain certificates from a CA, request updates for them, and also get them revoked.
There are many subtle differences between CA signed and self-signed certificates, especially in the amount of trust that can be placed in the security assertions of the certificate. Some CAs can verify the identity of the person to whom they issue a certificate; for example the US military issues their Common Access Cards in person, with ...