Re: Cracking & auditing crypto protocols

I'm not sure whether it is fair to call Walter Tuchman a Real Cryptanalyst, but there are many reasons to suspect that he is a talented one. When he headed the IBM team developing DES, it is said (by Coppersmith) that they developed many attacks like what we now know as Differential Cryptanalysis. These contributed to their design of DES and I think it would be fair to say that the same principles could be used to assess the strength of the Clipper chip. A Mykotronix employee told me that it "Contains s-boxes and all that stuff." I don't know whether he was the one responsible for these insights back then, but he certainly was in the right place to learn alot by osmosis. -Peter