At 01:33 2005-11-01 -0600, Travis H. wrote:
The latest hashes, such as SHA-1, gave up on Feistel.
Not so... the SHA family are all unbalanced Feistel structures. Basically, for SHA-1 a complex function of 4 words and key material (in this case expanded data to be hashed) is combined with the fifth word. The fact that the four words don't change is the giveaway that it's a feistel structure. The later SHAs have a more complicated structure, blurring the boundary a bit, but I'd still call them unbalanced Feistel.
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