RC4 improvement idea
Perry E. Metzger
perry at piermont.com
Mon Apr 8 23:25:46 PDT 1996
Noel Yap writes:
> The S-Boxes in DES were optimized to hinder Differential
> Cryptanalysis. I've seen no studies on the effectiveness of
> jumbling the S-Boxes during encryption -- even Biham and Shamir's
> book doesn't mention it -- but, I figure, if it helps, DES would
> probably already be doing it (unless of course the NSA thought the
> jumbling would make too good an algorithm).
Your conclusion may be correct, but your reasoning is faulty. DES was
built to be run in hardware, which doesn't make S-Box jumbling easy;
it was in fact built to be run on the hardware of twenty years ago,
which was far more constrained than our hardware is now.
Perry
More information about the cypherpunks-legacy
mailing list