We are particularly interested in attacks aiming at recovering the internal state, the secret key or at forging a MAC. Other attacks would be appreciated as well. Competitors have the freedom to increase the input rate of Ketje. The attack can be applied to any of the four instances of Ketje.
Who wins the prize will be decided by consensus in the Keccak team. Some hints:
The Ketje authenticated encryption scheme has already established such a solid reputation in Belgium that a beer was named after it. Unfortunately, it is already sold out since 2011. Instead, the winner will receive a selection of Belgian beers.
The attacks should be submitted to the
googlegroups.com mailing list (with
noekeon.org in CC) before January 31st, 2018.
The results are here.