We congratulate Meicheng Liu¹ and Jian Guo² for being the first ones to solve a 4-round pre-image challenge in the Keccak Crunchy Crypto Collision and Pre-image Contest!

They found a pre-image of a given 80-bit digest for Keccak[r=1440, c=160] reduced to its first 4 rounds. Up to now, only pre-image challenges up to 3 rounds had been solved.

1. State Key Laboratory of Information Security, Institute of Information Engineering, Chinese Academy of Sciences, China
2. Nanyang Technological University, Singapore