The cryptographic sponge is a construction scheme for hash functions (and other symmetric primitives) based on an unkeyed permutation. The most famous example is Keccak, which won the SHA-3 competition.

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What is the general idea of truncated differential attack on hash functions?

What is the general idea of truncated differential attack on hash functions ? i'm using stream cipher and sponge hash construction and i want to know what is the general idea of differential attack ...