The Keccak sponge function family

Guido Bertoni1, Joan Daemen1,2, Michaël Peeters1 and Gilles Van Assche1

2Radboud University




Software and other files


The figures above are available under the Creative Commons Attribution license. In short, they can be freely used, provided that attribution is properly done in the figure caption, either by linking to this webpage or by citing the article where the particular figure first appeared.


Cryptanalysis prize

23 January 2009

Inspired by Dan Bernstein's CubeHash prizes, we offer a prize for the most interesting Keccak cryptanalysis. The results must be publicly available on an URL that is sent to keccak -at- noekeon -dot- org before February 23, 2009 at 12:00 GMT+1. We reserve the right to extend this deadline in the absence of interesting results. Otherwise, the winner will be announced during the Rump session of the first SHA-3 candidate conference in Leuven.

Who wins the prize will be decided by consensus in the Keccak team. Similar to Dan Bernstein, we will use a system of points. Some hints:

We wanted to offer a prize which has a cultural dimension and is likely to appeal to the typical cryptanalyst. This forced us to the choice we have made. The prize is a case with 24 bottles of 33cl Trappist beers from all 6 recognized Trappist breweries in Belgium. It includes bottles of Westmalle Dubbel, Westmalle Tripel, Chimay bleue, Chimay rouge, Chimay blanche, Rochefort 8, Rochefort 10, Orval, Achel Blond, Achel Bruin and probably the most hard to get beer in the world: the mythical Westvleteren 12°.

In case there is a winner by the first SHA-3 candidate conference and she/he/they are present, we'll bring the case to Leuven and hand it over there. Otherwise, we'll do our best to bring the case and the winners together. Once the winner is known there is no hurry as the expiry dates on most of the bottles are years from now.