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hash function
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hash function

In computing, an algorithm that calculates a value from the content of a message which can then be used to detect alterations to the original message.

Similar to a checksum but with greater security, hash functions play an important role in secure cryptographic systems (see cryptography), where authentication is as important as hiding the data from third parties.
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In this approach, the administrator who suspects a compromised host can create new hash values and compare the new hash values to a set of "known good" values.
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This database is a collection of hash values (or "digital fingerprints") calculated for executable files to act as digital identifiers.
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