🚀 go-pugleaf

uri@watson.ibm.com (Uri Blumenthal,35-016,8621267,) writes:

>From article by spc@pineal.math.fau.edu (Sean 'Captain Napalm' Conner):
>>   -spc (And on a related note:  Is there any information as to the ORIGINAL
>> 	specification for DES that IBM summited to the NSA that is
>> 	available?  Just asking ... )

>Sorry to disappoint you - those "original" specs aren't different
>from what you can get now from ANSI (:-).

	From what I understand, that's not totally true.  While the _specs_
might be the same, IBM also submitted a rationale for the DES method.  This
rationale document remains classified, and some wonder if it contains
information that severely weakens DES.  Some specific things that are
supposedly covered include the design of th S-boxes, i.e: why this
permutation and not some other?  For an interesting discussion of
research into the S-boxes, try "Cryptology for Mathematicians and Computer
Scientists."  I don't have it handy, or I'd give an author and ISBN.
The book is quite good, and gives Pascal source for DES and RSA
implementations.

See ya,
Heath

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From the Home for Amnesiac Computer Scientists....
  heathh@cco.caltech.edu