AS ISO/IEC 9797.1:2019 PDF
The objective of this Standard is to specify six MAC algorithms that use a secret key and an n-bit block cipher to calculate an m-bit MAC.
This part of ISO/IEC 9797 specifies six MAC algorithms that are based on an n-bit block cipher. They compute a short string as a function of a secret key and a message of variable length.
The strength of the data integrity mechanism and message authentication mechanism is dependent on the length (in bits) k* and secrecy of the key, on the block length (in bits) n and strength of the block cipher, on the length (in bits) m of the MAC, and on the specific mechanism.
The first mechanism specified in this part of ISO/IEC 9797 is commonly known as CBC-MAC (CBC is an abbreviation of Cipher Block Chaining).
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