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message digest

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n. ~ 1. Computing · A unique numerical value derived from a data stream, typically through a one-way hash function, that can be used to test the integrity of the data stream. - 2. A collection of email messages sent to a distribution list over a period of time and combined into a single email message for distribution.

Notes: 

A message digest1 can be generated using the MD5, secure hash algorithm (SHA), or other algorithms. If a message digest is calculated on a data stream and compared to an earlier message digest, it is possible to determine if there has been even a minor alteration in the content of the data stream. Message digests are key components of digital signatures.