Web Definition: Certificate
In cryptography, a public key certificate is a certificate which uses a digital signature to bind together a public key with an identity — information such as a the name of a person or an organisation, their address & so forth. The certificate can be used to verify that a public key belongs to an individual. In a typical PKI scheme, the signature will be of a certificate authority. In a web of trust scheme, the signature is of either the user or other users. In either case, the signatures on a certificate are attestations by the certificate signer that the identity information & the public key belong together. Certificates can be used for the large-scale use of public-key cryptography. Securely exchanging secret keys amongst users becomes impractical to the point of effective impossibility for anything other than quite small networks. Public key cryptography provides a way to evade this problem. In principle, if Alice wants others to be able to send her secret messages, she need only publish her public key. Anyone possessing it can then send her secure information.
Read More »Dictionary Entry: A written testimony to the truth of any fact - as, certificate of good behavior. To verify or vouch for by certificate.
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