A feistel-network or feistel cipher is a structure that has been used to create a number of different block ciphers (e.g., DES, Blowfish, Twofish, RC6).
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Does unbalancing a feistel cipher always improve security? Does it improve security at all?
So according to wikipedia unbalanced feistel ciphers provide greater provable security. Specifically, they state:
The Thorp shuffle is an extreme case of an unbalanced Feistel cipher in which one ...
