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The **Data Authentication Algorithm** (**DAA**) is a former U.S. government standard for producing cryptographic message authentication codes. DAA is defined in FIPS PUB 113,^{[1]} which was withdrawn on September 1, 2008. The algorithm is not considered secure by today's standards.

According to the standard, a code produced by the DAA is called a **Data Authentication Code** (**DAC**). The algorithm 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 DES as the underlying cipher, truncated to between 24 and 56 bits (inclusive).

**^**FIPS PUB 113 - Computer Data Authentication - the Federal Information Processing Standard publication that defines the Data Authentication Algorithm

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