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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).
It allows the presenter of a certificate to bear the resource cost involved in providing Online Certificate Status Protocol (OCSP) responses by appending ("stapling") a time-stamped OCSP response signed by the CA (certificate authority) to the initial TLS handshake, eliminating the need for clients to contact the CA, with the aim of improving ...
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) 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]
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]
Certificate Transparency (CT) is an Internet security standard for monitoring and auditing the issuance of digital certificates. [1] When an internet user interacts with a website, a trusted third party is needed for assurance that the website is legitimate and that the website's encryption key is valid.
In cryptography, a public key certificate, also known as a digital certificate or identity certificate, is an electronic document used to prove the validity of a public key. [ 1 ] [ 2 ] The certificate includes the public key and information about it, information about the identity of its owner (called the subject), and the digital signature of ...
In public key infrastructure, a validation authority (VA) is an entity that provides a service used to verify the validity or revocation status of a digital certificate per the mechanisms described in the X.509 standard and RFC 5280 (page 69). [1]