Data Authentication Algorithm: Difference between revisions

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{{Short description|Message authentication code algorithm}}

A '''Data Authentication Code''' is a [[message authentication code]] that has been computed with the [[Data Authentication Algorithm]], a U.S. government standard.

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The '''Data Authentication Algorithm''' ('''DAA''') is a former [[Federal Information Processing Standard|U.S. government standard]] for producing cryptographic [[message authentication code]]s. DAA is defined in FIPS PUB 113,<ref>[http://csrc.nist.gov/publications/fips/fips113/fips113.html FIPS PUB 113 – Computer Data Authentication] – the [[Federal Information Processing Standard]] publication that defines the Data Authentication Algorithm</ref> which was withdrawn on September 1, 2008.{{Citation needed|date=July 2021}} The algorithm is not considered secure by today's standards.{{Citation needed|date=July 2021}}

According to the standard, a code produced by the DAA is called a '''Data Authentication Code''' ('''DAC'''). The algorithm [[Block cipher mode of operation#Cipher block chaining (CBC)|chain encrypts]] the data, with the last cipher block truncated and used as the DAC.

The DAA is equivalent to [[ISO/IEC 9797-1]] MAC algorithm 1, or [[CBC-MAC]], with [[Data Encryption Standard|DES]] as the underlying cipher, truncated to between 24 and 56 bits (inclusive).

==Sources==

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* [http://www.itl.nist.gov/fipspubs/fip113.htm FIPS 113 - Computer Data Authentication] - the [[Federal Information Processing Standards]] publication that defines how to compute the Data Authentication Code

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[[Category:Message authentication codes]]

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