[Cryptography] An observation on a Skipjack-style Feistel network

[Ryan Carboni]

An observation on a Skipjack-style Feistel network: Assuming the round
function is a pseudo-random permutation, it would achieve security a single
round faster than a feistel network.

Balanced Feistel network of AES round function: 4 rounds for full diffusion.
Skipjack-style Feistel network of AES round function: 3 rounds for full
diffusion.
128-bit Rijndael: 2 rounds for full diffusion.
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