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International audienceThe hash function Skein is one of the five finalists of the NIST SHA-3 competition. It is based on the block cipher Threefish which only uses three primitive operations: modular addition, rotation and bitwise XOR (ARX). This paper studies the boomerang attacks on Skein-512. Boomerang distinguishers on the compression function reduced to 32 and 36 rounds are proposed, with time complexities 2104.5 and 2454 hash computations respectively. Examples of the distinguishers on 28 and 31 rounds are also given. In addition, the boomerang distinguishers are applicable to the key-recovery attacks on reduced Threefish-512. The time complexities for key-recovery attacks reduced to 32-/33-/34-round are about 2181, 2305 and 2424 encryptions. Because the previous boomerang distinguishers for Threefish-512 are in fact not compatible [14], our attacks are the first valid boomerang attacks for the reduced-round Skein-512

The Boomerang Attacks on the Round-Reduced Skein-512