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CRL for a revoked cert of Verisign CA. There are two different states of revocation defined in RFC 5280: Revoked A certificate is irreversibly revoked if, for example, it is discovered that the certificate authority (CA) had improperly issued a certificate, or if a private-key is thought to have been compromised.
The CA then produces and distributes cryptographically authenticated attestations that the certificate has been revoked. [12] The CA/B requirements also allow a CA to autonomously revoke certificates if the CA is aware of a possibility of compromise. [13] Anyone may submit such evidence. [14]
A series of incorrectly issued certificates from 2001 onwards [1] [2] damaged trust in publicly trusted certificate authorities, [3] and accelerated work on various security mechanisms, including Certificate Transparency to track misissuance, HTTP Public Key Pinning and DANE to block misissued certificates on the client side, and CAA to block misissuance on the certificate authority side.
The certificate is also a confirmation or validation by the CA that the public key contained in the certificate belongs to the person, organization, server or other entity noted in the certificate. A CA's obligation in such schemes is to verify an applicant's credentials, so that users and relying parties can trust the information in the issued ...
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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.
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In 2020, the S/MIME Certificate Working Group [3] of the CA/Browser Forum was chartered to create a baseline requirement applicable to CAs that issue S/MIME certificates used to sign, verify, encrypt, and decrypt email. That effort is intended to create standards including: Certificate profiles for S/MIME certificates and CAs that issue them