Checksum

CHECKSUM

        A simple error-detection scheme in which each transmitted message is accompanied by a numerical value based on the number of set bits in the message.

1. A checksum or hash sum is a small-size datum from an arbitrary block of digital data for the purpose of detecting errors which may have been introduced during its transmission or storage. It is usually applied to an installation file after it is received from the download server.

   A checksum or hash sum is a small-size datum from an arbitrary block of digital data for the purpose of detecting errors which may have been introduced during its transmission or storage.  (According toWikipedia)

   The actual procedure which yields the checksum, given a data input is called a checksum function or checksum algorithm.