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This reversible status can be used to note the temporary invalidity of the certificate (e.g., if the user is unsure if the private key has been lost). If, in this example, the private key was found and nobody had access to it, the status could be reinstated, and the certificate is valid again, thus removing the certificate from future CRLs.
It is described in RFC 6960 and is on the Internet standards track. It was created as an alternative to certificate revocation lists (CRL), specifically addressing certain problems associated with using CRLs in a public key infrastructure (PKI). [3] Messages communicated via OCSP are encoded in ASN.1 and are usually communicated over HTTP.
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]
The Online Certificate Status Protocol (OCSP) stapling, formally known as the TLS Certificate Status Request extension, is a standard for checking the revocation status of X.509 digital certificates. [1]
The Cross Island Line (CRL) is a high capacity Mass Rapid Transit (MRT) line under development in Singapore. It will run in an east–west direction from Changi to Jurong Industrial Estate via Loyang , Pasir Ris , Hougang , Serangoon North , Ang Mo Kio , Sin Ming , Bukit Timah , Clementi and West Coast .
Tracking-system on a forklift An M998 High-Mobility Multipurpose Wheeled Vehicle (HMMWV) carrying a radar and tracking system shelter sits parked at an airfield during Operation Desert Shield. The shelter is used by the Marines of the 3rd Remotely Piloted Vehicle (RPV) Platoon to track their Pioneer RPVs during flight.
The Online Certificate Status Protocol (OCSP) governs real-time confirmation of certificate validity. PKIX Certificate and CRL Profile (RFC 3280). The first part of the four-part standard under development by the Public-Key Infrastructure (X.509) working group of the IETF (known as PKIX) for a public-key infrastructure for the Internet.
To better understand how an offline root CA can greatly improve the security and integrity of a PKI, it is important to realize that a CRL is specific to the CA which issued the certificates on the list. Therefore, each CA (root or intermediate) is only responsible for tracking the revocation of certificates it alone has issued.