(1) In secure communication, an algorithmic pattern used to decrypt messages that were encrypted by the corresponding private key. A public key is also used to encrypt messages that can be decrypted only by the corresponding private key. Users broadcast their public keys to everyone with whom they must exchange encrypted messages. See also key, private key.
(2) In computer security, a key that is made available to everyone. See also private key.
(3) The non-secret half of a cryptographic key pair that is used with a public key algorithm. The public key is made available to everyone. Public keys are typically used to verify digital signatures or decrypt data that has been encrypted with the corresponding private key. See also private key.
(4) An encryption key associated with a Notes ID that is used to verify an electronic signature, encrypt a message, or identify an authenticating user. A public key is part of each user ID, and a copy of the key is stored in the Domino Directory. Certificates on IDs ensure that public keys are valid.