ISO IEC 9797-2:2021 pdf download – Information security — Message authentication codes (MACs) — Part 2: Mechanisms using a dedicated hash- function. 1 Scope This document specifies MAC algorithms that use a secret key and a hash-function (or its round- function or sponge function) to calculate an m-bit MAC. These mechanisms can be used as data integrity mechanisms to verify that data has not been altered in an unauthorized manner. NOTE A general framework for the provision of integrity services is specified in ISO/IEC 10181-6. 2 Normative references The following documents are referred to in the text in such a...