We congratulate Jian Guo¹, Meicheng Liu^1,2, Ling Song^1,2,3 and Kexin Qiao^2,3,1,4 for being the first ones to solve a 5-round collision challenge in the Keccak Crunchy Crypto Collision and Pre-image Contest!

They generated a collision for a Keccak variant with capacity 160 bits, calling the Keccak-f permutation with width 1600 and 5 rounds.

Remarkably, this breakthrough came only one month after two members of the same team, Jian and Meicheng, generated the first 3-round pre-images in our contest. [More details…]

1. Cryptanalysis Taskforce, Temasek Laboratories @ Nanyang Technological University, Singapore
2. State Key Laboratory of Information Security, Institute of Information Engineering, Chinese Academy of Sciences, China
3. Data Assurance and Communication Security Research Center, Chinese Academy of Sciences, China
4. University of Chinese Academy of Sciences, China