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electronic documents. [Computer and Information Sciences] n., Extra data appended to a message which identifies and authenticates the sender and message data using public-key encryption.
[Computer and Information Sciences] 
n., Data appended to a unit of data held on a computer, or a cryptographic transformation of a data unit, that allows the recipient
of the data unit to prove its source and integrity and protects against forgery. The International Standards Organization defined
this means of identifica