Re: problems with SHA-1

1997-06-25 Thread Mark Eichin
> knew about another attack), and they reduced the key size to 56 bit so > they could crack it with brute force in massively parallell hardware. Umm, no, part of the *problem* with lucifer is that the 128 bit key had symmetries that made it's strength *trivially* less than 64 bit and as I recall

Re: problems with SHA-1

1997-06-25 Thread Shaya Potter
On Tue, 24 Jun 1997, Nathan E Norman wrote: > > On 25 Jun 1997, Mark Eichin wrote: > > : > :> IBM developed a cypher called "lucifer". The NSA examined it, > :> recommended some changes to the algorithm, and the result was DES. > : > :Changes which, we now know, *strengthened* it against differ

Re: problems with SHA-1

1997-06-25 Thread Thomas Koenig
Mark Eichin wrote: >> IBM developed a cypher called "lucifer". The NSA examined it, >> recommended some changes to the algorithm, and the result was DES. > >Changes which, we now know, *strengthened* it against differential >cryptanalysis (which they new about in the 70's, and called the >"slidin

Re: problems with SHA-1

1997-06-25 Thread Nathan E Norman
On 25 Jun 1997, Mark Eichin wrote: : :> IBM developed a cypher called "lucifer". The NSA examined it, :> recommended some changes to the algorithm, and the result was DES. : :Changes which, we now know, *strengthened* it against differential :cryptanalysis (which they new about in the 70's, and

Re: problems with SHA-1

1997-06-25 Thread Mark Eichin
> IBM developed a cypher called "lucifer". The NSA examined it, > recommended some changes to the algorithm, and the result was DES. Changes which, we now know, *strengthened* it against differential cryptanalysis (which they new about in the 70's, and called the "sliding attack", if I remember

Re: problems with SHA-1

1997-06-24 Thread Shaya Potter
On Tue, 24 Jun 1997, Nathan E Norman wrote: > > On Tue, 24 Jun 1997, Shaya Potter wrote: > > :On Mon, 23 Jun 1997, Bruce Perens wrote: > : > :> The problem with SHA-1 is that it is a U.S. Federal Information Processing > :> Standard, and I don't trust that the U.S. government will not place expo

Re: problems with SHA-1

1997-06-24 Thread Nathan E Norman
On Tue, 24 Jun 1997, Shaya Potter wrote: :On Mon, 23 Jun 1997, Bruce Perens wrote: : :> The problem with SHA-1 is that it is a U.S. Federal Information Processing :> Standard, and I don't trust that the U.S. government will not place export :> restrictions on it. I'm also wary of U.S. FIPS for th

Re: problems with SHA-1

1997-06-24 Thread Shaya Potter
On Mon, 23 Jun 1997, Bruce Perens wrote: > The problem with SHA-1 is that it is a U.S. Federal Information Processing > Standard, and I don't trust that the U.S. government will not place export > restrictions on it. I'm also wary of U.S. FIPS for the same reason I'm wary > about DES - various spy