checksum
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Microsoft Exchange 2007
A computed value that depends on the contents of a file. It is stored with data to detect file corruption. The system checks this value to ensure that the data is not corrupted. [Exchange 2007]
Telecommunications
The sum of a group of data items, which sum is used for checking purposes. Note 1: A checksum is stored or transmitted with the group of data items. Note 2: The checksum is calculated by treating the data items as numeric values. Note 3: Checksums are used in error detecting and correcting. 2. [The] value computed on data to detect error or manipulation during transmission. See hash total. [INFOSEC-99]