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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, via some parity or hashing algorithm, on information requiring protection against error or manipulation. Note: Checksums are stored or transmitted with data and are intended to detect data integrity problems. [NIS]