In cryptography, a certificate authority or certification authority (CA) is an entity that issues digital certificates for use by other parties. It is an example of a trusted third party. CAs are characteristic of many public key infrastructure (PKI) schemes. |
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In cryptography, X.509 is an ITU-T standard for a public key infrastructure (PKI) for single sign-on (SSO) and Privilege Management Infrastructure (PMI). X.509 specifies, among other things, standard formats for public key certificates, certificate revocation lists, attribute certificates, and a certification path validation algorithm.
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The Telecommunication Standardization Sector (ITU-T) coordinates standards for telecommunications on behalf of the International Telecommunication Union (ITU). The ITU-T is based in Geneva, Switzerland. |
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A Public Key Infrastructure (PKI) certificate allows someone to combine their digital signature with a public key and an identifier, such as their full name. A PKI certificate is a security mechanism for public keys, used to allow computer users to show that they own the public keys they claim. |
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