Hamsi is a family of cryptographic hash functions designed by Ozgul Kucuk. It is one of the second round candidates. The iteration mode of Hamsi is based on the `Concatenate-Permute-Truncate` design strategy. We recently published a paper titled "Message Recovery and Pseudo-preimage Attacks on the Compression Function of Hamsi-256" at PROGRESS IN CRYPTOLOGY – LATINCRYPT 2010.
Abstract: Hamsi is one of the second round candidates of the SHA-3 competition. In this study, we present non-random differential properties for the compression function of Hamsi-256. Based on these properties, we first demonstrate a distinguishing attack that requires a few evaluations of the compression function. Then, we present a message recovery attack with a complexity of 210.48 compression function evaluations. Also, we present a pseudo-preimage attack for the compression function with complexity 2254.25.
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