# Tag Info

Keccak is Sponge-based hash function: [Image taken from the official sponge page] It has a large internal state, and iterates this with a permutation (that for theoretical proofs we model as an ideal permutation). The total state of Keccak is $s=r+c$ bits. Because the user can only ever read from or input data into the $r$-section of this (the 'rate ...