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Longman Dictionary of Contemporary English
digital signature
▪ If the fingerprints do match, however, then Y can be quite sure that the digital signature is authentic.
▪ Therefore the digital signature verifies both the identity of the sender and the authenticity of the data in the document.
Digital signature

A digital signature is a mathematical scheme for demonstrating the authenticity of a digital message or documents. A valid digital signature gives a recipient reason to believe that the message was created by a known sender, that the sender cannot deny having sent the message ( authentication and non-repudiation), and that the message was not altered in transit ( integrity).

Digital signatures are a standard element of most cryptographic protocol suites, and are commonly used for software distribution, financial transactions, contract management software, and in other cases where it is important to detect forgery or tampering.