[42216] in Cypherpunks
Re: textbooks
daemon@ATHENA.MIT.EDU (Patrick Horgan)
Wed Oct 25 00:00:04 1995
Date: Tue, 24 Oct 1995 20:53:27 -0700
From: patrick@Verity.COM (Patrick Horgan)
To: patrick@Verity.COM, sommerfeld@orchard.medford.ma.us
Cc: cypherpunks@toad.com, sandoval@cic.teleco.ulpgc.es
> > The quick proof of why the initial and final permutations add nothing to
> > the security of DES is presented in an informal and quite obvious sidebar.
>
> Actually, I found the proof not completely convincing. It's really a
> proof that it doesn't strengthen the DES against a *known plaintext*
> attack, but there are other weaker attacks it may make marginally more
> difficult (or easier..); for instance, partially-known plaintext or
> some forms of verifiable plaintext.
>
I'm afraid I'm not quite following you here, could you expound a bit?
Ah:) Isn't it great to be talking about encryptions again?:)
Patrick
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