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In telecommunication, a 'redundancy check' is extra data added to a message for the purposes of error detection and correction.
Any hash function can be used as a redundancy check. The simplest redundancy checks, called checksums, include parity bits, check digits, and longitudinal redundancy check. Other types of redundancy check include cyclic redundancy check, horizontal redundancy check, vertical redundancy check, and cryptographic message digest.
A ''parity bit'' is an ''error detection'' mechanism that can only detect an odd number of errors.