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1

I sent a mail to the Keccak team asking about this, and I got a response from one of the authors (Joan Daemen to be specific). According to him, we actually can instantiate Sponge functions and Duplex objects with a "transformation" in addition to a permutation, the latter of which is what we commonly do. As long as the underlaying (fixed-width) function ...


2

As you probably saw in the reference linked, there are multiple types of "basic" generalized Feistel networks: Type-1, Type-2 and Type-3. As far as I can tell all of these were introduced at CRYPTO'89 by Zheng, Matsumoto, and Imai in "On the Construction of Block Ciphers Provably Secure and Not Relying on Any Unproved Hypotheses". Suppose that your state is ...


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