In cryptography, certificate authority, or certification authority, (CA) is an entity that issues digital certificates. The digital certificate certifies the ownership of a public key by the named subject of the certificate. This allows others (relying parties) to rely upon signatures or assertions made by the private key that corresponds to the public key that is certified. In this model of trust relationships, a CA is a trusted third party that is trusted by both the subject (owner) of the certificate and the party relying upon the certificate. CAs are characteristic of many public key infrastructure (PKI) schemes.
Commercial CAs charge to issue certificates that will automatically be trusted by most web browsers (Mozilla maintains a list of at least 36 trusted root CAs, though multiple commercial CAs or their resellers may share the same trusted root). The number of web browsers and other devices and applications that trust a particular certificate authority is referred to as ubiquity.
Aside from commercial CAs, some providers issue digital certificates to the public at no cost. Large institutions or government entities may have their own CAs.
Other articles related to "certificate authority, certificates, certificate":
... A robot certificate authority is a certificate authority (CA) which automatically signs public keys which match some requirement ...
... There exist several open source implementations of certificate authority software ... services to issue, revoke and manage digital certificates ... but comes with tools allowing its use as a simple certificate authority ...
... the applicant (such as a distinguished name in the case of an X.509 certificate), and the public key chosen by the applicant ... or proofs of identity required by the certificate authority, and the certificate authority may contact the applicant for further information ... Usually the email address of the certificate administrator or IT department If the request is successful, the certificate authority will send back an identity ...
Famous quotes containing the words authority and/or certificate:
“Women who assume authority are unnatural. Unnatural women are lesbians. Therefore all the leaders of the womens movement were presumed to be lesbians.”
—Jane OReilly, U.S. feminist and humorist. The Girl I Left Behind, ch. 8 (1980)
“God gave the righteous man a certificate entitling him to food and raiment, but the unrighteous man found a facsimile of the same in Gods coffers, and appropriated it, and obtained food and raiment like the former. It is one of the most extensive systems of counterfeiting that the world has seen.”
—Henry David Thoreau (18171862)