At 02:44 PM 10/1/96 -0400, Perry wrote:

We really have to work on cracking DES at least once -- it would substantially reduce the wind in the Administration's sails.

56 bits + GAK does generally mean DES/GAK, though RC4/56/GAK is also possible. One "56-bit" protocol that might be allowable under the new rules is "something strong with all but 56 key bits revealed", e.g. RC4/128 with 72 bits salt revealed (like the RC4/128 with 88 bits salt revealed that Netscape uses, or 3-DES with 112 bits salt revealed), which would be substantially stronger against cracking than raw 56-bit DES. A big advantage is that it makes pre-computation of lists less useful, since two cyphertexts with the same 56-bit key might be different in the top N-56 bits of key, and the key schedules are less reusable. The 3DES version, for instance, also gains because some of the big DES hooks that let you scrounge a few bits don't work. # Thanks; Bill # Bill Stewart, +1-415-442-2215 stewarts@ix.netcom.com America's Open Presidential Debate - Beyond Dole and Clinton! <A href="http://gate.net/~bdcollar/bbe/media.htm">Tuesday, Oct. 8th 8:00 PM EDT</a>