SHA-3, originally known as Keccak, is a cryptographic hash function designed by Guido Bertoni, Joan Daemen, Michaël Peeters, and Gilles Van Assche.

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What does “nonlinear mapping” mean?

Page 15 of the Keccak reference (PDF) explains that the $Chi$ step mapping of the Keccak-f permutation in Keccak is defined to be “nonlinear mapping”. Without this, the complete permutation would be ...
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Question about the Theta step of Keccak

In the question What criteria make the theta step of Keccak's round function reversible?, poncho said that:In the Keccak case, the actual value of z=64 is not a multiple of L(5), and hence θ is ...