Digital signature

<cryptography> Extra data appended to a message which identifies and authenticates the sender and message data using public-key encryption.

The sender uses a one-way hash function to generate a hash-code of about 32 bits from the message data.

He then encrypts the hash-code with his private key.

The receiver recomputes the hash-code from the data and decrypts the received hash with the sender's public key.

If the two hash-codes are equal, the receiver can be sure that data has not been corrupted and that it came from the given sender.

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