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The OCSP responder uses the certificate serial number to look up the revocation status of Alice's certificate. The OCSP responder looks in a CA database that Carol maintains. In this scenario, Carol's CA database is the only trusted location where a compromise to Alice's certificate would be recorded.
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]
CAs must add a new field, a revocation number, to each issued certificate, allowing certificates from a single CA to be identified by a tuple of certificate expiration date and revocation number; this tuple allows a client to efficiently locate a bit giving the identified certificate's status within the CRV.
The most common reason for revocation is the user no longer being in sole possession of the private key (e.g., the token containing the private key has been lost or stolen). Hold 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).
Without revocation, an attacker would be able to exploit such a compromised or mis-issued certificate until expiry. [15] Hence, revocation is an important part of a public key infrastructure. [16] Revocation is performed by the issuing certificate authority, which produces a cryptographically authenticated statement of revocation. [17]
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Revocation of legal rights, privileges, or license can occur either administratively or through criminal courts. A common example is the revocation of a driver's license for egregious or repeated violations of traffic laws , which can be done by a criminal court, or an administrative traffic court, depending on jurisdiction. [ 4 ]
(A.F.M.), but technically the VAT identification number and the taxpayer registration number Α.Φ.Μ. are different register numbers and should not be confused. Közösségi adószám Hungary ANUM HU 'HU' + 8 digits (the first 8 digits of the national tax number) – e.g. HU12345678 Value added tax identification no. Ireland VAT or CBL IE