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check-value function
Function f which maps strings of bits and a short secret key, i.e. a key that can readily be entered into or read from a user device, to fixed-length strings of bits, satisfying the following properties: - for any key k and any input string d, the function f(d, k) can be computed efficiently; - it shall be computationally infeasible to find a pair of data strings (d, d’) for which the number of keys which satisfy f(d, k) = f(d’, k) is more than a small fraction of the possible set of keys. NOTE 1 In practice, a short key would typically contain 4-6 digits or alphanumeric characters. NOTE 2 In practice, security is maximized if the set of possible outputs from the check-value function is the same size as the set of possible keys.
source: ISO9798-6, 2005
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