HAIFA_construction
HAIFA construction
Design method for cryptographic hash functions
The HAIFA construction (hash iterative framework) is a cryptographic structure used in the design of hash functions. It is one of the modern alternatives to the Merkle–Damgård construction,[1] avoiding its weaknesses like length extension attacks. The construction was designed by Eli Biham and Orr Dunkelman in 2007.
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Three of the 14 second round candidates in the NIST hash function competition were based on HAIFA constructions (BLAKE, SHAvite-3, ECHO). Other hash functions based on it are LAKE, Sarmal, SWIFFTX and HNF-256. The construction of Skein (Unique Block Iteration) is similar to HAIFA.[2] Another alternative construction is the sponge construction.