Definition of "checksum" [checksum]

• A digit or character, derived by applying a suitable algorithm to some data, used to check whether errors have occurred in transmission, storage or data entry (noun)
• To compute a checksum. (verb)

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• "Of course, it's assuming that whoever built the downloadable file, computed the checksum, and wrote the web page listing the checksum is honest, but it's still a useful check to make."
• "That's when Apple first introduced a special operation, called a checksum hash, into its products to ensure that Apple's devices were communicating with iTunes and not some other type of software."
• "A checksum is a fixed-size datum that is computed from a block of data."