Date: Fri, 26 Jul 1996 20:32:34 +0200 From: Poul-Henning Kamp <phk@critter.tfs.com> To: Nathan Lawson <nlawson@kdat.csc.calpoly.edu> Cc: freebsd-security@freebsd.org Subject: Re: Crack 4.1 patches for FBSD Message-ID: <2867.838405954@critter.tfs.com> In-Reply-To: Your message of "Fri, 26 Jul 1996 07:27:37 PDT." <199607261427.HAA02418@kdat.calpoly.edu>
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>> Any news on any attacks on our MD5 based passwords ? > >The only problem I see with them is that MD5 is so darn quick, your number >of crypts goes way up even with the present number of iterations. The DES >hash used in most Unicen was desigend to be slow (originally taking 1 second >per crypt on a VAX 11/780), but that fell prey to optimization and exponential >CPU speed increases. > >Perhaps some intermediate permutations between hashes might be appropriate, >but I'd consider the algorithm very carefully as it is very easy to end up >with something that is no slower than the original and significantly less >secure. Have you actually timed them ? Have you actually looked at the code that generates the MD5 passwords in FreeBSD ? It sounds to me like you havn't... -- Poul-Henning Kamp | phk@FreeBSD.ORG FreeBSD Core-team. http://www.freebsd.org/~phk | phk@login.dknet.dk Private mailbox. whois: [PHK] | phk@ref.tfs.com TRW Financial Systems, Inc. Future will arrive by its own means, progress not so.
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