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Signature (digital)

A quantity (number) associated with a message that only someone with knowledge of your private key could have generated, but that can be verified through knowledge of your public key.

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This is an information system utilizing an algorithm or series of algorithms which provide a cryptographic key pair consisting of a private key and a corresponding public key. The keys of the pair have the properties that (1) the public key can verify a digital signature that the private key creates, and (2) it is computationally infeasible to discover or derive the private key from the public key. The public key can therefore be disclosed without significantly risking disclosure of the private key. This can be used for confidentiality as well as for authentication.
Perform a cryptographic calculation using a message, a signature for the message, and a public key, to determine whether the signature was generated by someone knowing the corresponding private key.
A secret value that is used to encrypt or decrypt messages and is kept secret and known only to the user; used in conjunction with a public key in asymmetrical cryptography. The private or secret key of a key pair, which must be kept confidential and is used to decrypt messages encrypted with the public key, or to digitally sign messages, which can then be validated with the public key.
A value that is used to encrypt or decrypt messages and is made public to any user and used with a private key in asymmetric cryptography. In an asymmetric cryptography scheme, the key that may be widely published to enable the operation of the scheme. Typically, a public key can be used to encrypt, but not decrypt, or to validate a signature, but not to sign.
A number known as a message digest generated from a hash function. Also . See hash function. Producing hash values for accessing data or for security. A hash value (or simply hash), also called a message digest, is a number generated from a string of text. The hash is substantially smaller than the text itself, and is generated by a formula in such a way that it is extremely unlikely that some other text will produce the same hash value. Hashing is also a common method of accessing data records. To create an index, called a hash table, for these records, you would apply a formula to each name to produce a unique numeric value.

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