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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 DAA is defined in FIPS PUB 113,^[1] which was withdrawn on September 1, 2008.^{[citation needed]} The algorithm is not considered secure by today's standards.^{[citation needed]} According to the standard, a code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).

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

v t e Cryptographic hash functions and message authentication codes
List Comparison Known attacks
Common functions	MD5 (compromised) SHA-1 (compromised) SHA-2 SHA-3 BLAKE2
SHA-3 finalists	BLAKE Grøstl JH Skein Keccak (winner)
Other functions	BLAKE3 CubeHash ECOH FSB Fugue GOST HAS-160 HAVAL Kupyna LSH Lane MASH-1 MASH-2 MD2 MD4 MD6 MDC-2 N-hash RIPEMD RadioGatún SIMD SM3 SWIFFT Shabal Snefru Streebog Tiger VSH Whirlpool
Password hashing/ key stretching functions	Argon2 Balloon bcrypt Catena crypt LM hash Lyra2 Makwa PBKDF2 scrypt yescrypt
General purpose key derivation functions	HKDF KDF1/KDF2
MAC functions	CBC-MAC DAA GMAC HMAC NMAC OMAC/CMAC PMAC Poly1305 SipHash UMAC VMAC
Authenticated encryption modes	CCM ChaCha20-Poly1305 CWC EAX GCM IAPM OCB
Attacks	Collision attack Preimage attack Birthday attack Brute-force attack Rainbow table Side-channel attack Length extension attack
Design	Avalanche effect Hash collision Merkle–Damgård construction Sponge function HAIFA construction
Standardization	CAESAR Competition CRYPTREC NESSIE NIST hash function competition Password Hashing Competition NSA Suite B CNSA
Utilization	Hash-based cryptography Merkle tree Message authentication Proof of work Salt Pepper

v t e Cryptography
General	History of cryptography Outline of cryptography Classical cipher Cryptographic protocol Authentication protocol Cryptographic primitive Cryptanalysis Cryptocurrency Cryptosystem Cryptographic nonce Cryptovirology Hash function Cryptographic hash function Key derivation function Secure Hash Algorithms Digital signature Kleptography Key (cryptography) Key exchange Key generator Key schedule Key stretching Keygen Machines Cryptojacking malware Ransomware Random number generation Cryptographically secure pseudorandom number generator (CSPRNG) Pseudorandom noise (PRN) Secure channel Insecure channel Subliminal channel Encryption Decryption End-to-end encryption Harvest now, decrypt later Information-theoretic security Plaintext Codetext Ciphertext Shared secret Trapdoor function Trusted timestamping Key-based routing Onion routing Garlic routing Kademlia Mix network
Mathematics	Cryptographic hash function Block cipher Stream cipher Symmetric-key algorithm Authenticated encryption Public-key cryptography Quantum key distribution Quantum cryptography Post-quantum cryptography Message authentication code Random numbers Steganography
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 {{Short description|Message authentication code algorithm}}
 {{More citations needed|date=July 2021}}
+{{one source |date=April 2024}}
 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.