checksum
1. 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]