Two Track MAC

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Two-Track-MAC is a message authentication code submitted to the NESSIE project in 2000 by Bart Van Rompay (KU Leuven) and Bert den Boer (debis AG).^[1] It is based on a dual-track hashing structure derived from RIPEMD, in which two parallel computation paths are combined to produce the final MAC.^[2]

It uses a dual-track structure derived from RIPEMD, in which two parallel computation paths are combined. This is superficially similar to constructions such as MDC-2, which also employ parallel processing, though the underlying designs differ significantly.^[2]

References

^ Preneel, Bart; Van Rompay, Bart; Granboulan, Louis; Martinet, Guillaume; Murphy, Sean; Shipsey, Rachel; White, James (September 2001). NESSIE Phase I: Selection of Primitives (PDF) (Report). NESSIE Project. Retrieved 2026-03-21.
^ ^a ^b den Boer, Bert; Van Rompay, Bart; Preneel, Bart; Vandewalle, Joos (2001). "New (two-track-) MAC based on the two trails of RIPEMD: Efficient, especially on short messages and for frequent key-changes". Selected Areas in Cryptography. Lecture Notes in Computer Science. Vol. 2259. Springer Publishing. pp. 314–324. doi:10.1007/3-540-45537-X_25.

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

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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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Two-Track-MAC

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