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In cryptography, N-Hash is a cryptographic hash function based on the FEAL round function, and is now considered insecure. It was proposed in 1990 by Miyaguchi et al; weaknesses were published the following year.
N-Hash has a 128-bit hash size. A message is divided into 128-bit blocks, and each block is combined with the hash value computed so far using the g compression function. g contains eight rounds, each of which uses an F function, similar to the one used by FEAL.
Eli Biham and Adi Shamir (1991) applied the technique of differential cryptanalysis to N-Hash, and showed that collisions could be generated faster than by a birthday attack for N-Hash variants with even up to 12 rounds.
References
- Eli Biham, Adi Shamir: Differential Cryptanalysis of Feal and N-Hash. EUROCRYPT 1991: 1–16
- S. Miyaguchi, K. Ohta, and M. Iwata: "128-bit hash function (N-hash)", NTT Review, 2(6), November 1990, pp128–132.
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