The Keccak sponge function family

Guido Bertoni1, Joan Daemen1, Michaël Peeters2 and Gilles Van Assche1

1STMicroelectronics

2NXP Semiconductors

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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.

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Simplifying Keccak's padding rule for round 3

17 January 2011

For the third round of the SHA-3 competition, we decided to shorten and simplify the padding rule used in Keccak. We also took the opportunity to provide a fresh new structure in our documentation, in particular for a clean split between general sponge-related aspects and Keccak-specific ones, and between implementation-related aspects and cryptographic ones.

We made the following changes to the Keccak specifications.

Note that no changes have been made to Keccak-f.

With this new version, we make the following documents available on our web page.

And obviously, the implementation packages have been updated and are available for download.