Date: Thu, 19 Aug 2004 16:53:53 +0200 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: Tig <tigger@onemoremonkey.com> Cc: freebsd-security@freebsd.org Subject: Re: Report of collision-generation with MD5 Message-ID: <19974.1092927233@critter.freebsd.dk> In-Reply-To: Your message of "Fri, 20 Aug 2004 00:48:43 %2B1000." <20040820004843.011b8de8@piglet.goo>
next in thread | previous in thread | raw e-mail | index | archive | help
In message <20040820004843.011b8de8@piglet.goo>, Tig writes: >On Wed, 18 Aug 2004 14:29:57 -0400 >"Peter C. Lai" <sirmoo@cowbert.net> wrote: > >> On Wed, Aug 18, 2004 at 09:08:12PM +0300, Claudiu wrote: >> > hello, >> > >> > please explain what do you mean by "reverse the hash". Is this the >> > recreation of the originial message from its hash ? >> >> The short answer is yes. The slightly longer answer is that such is >> only one specific case. The general case is that the digest should not >> reveal any information about the original message. >> > > >If this is the case, then it would be very cool! > >Imagine sending 32 bytes, then 'reverse the hash' to get XX MB's worth >of data :] > >That would be great compression! That would not be compression (and hopefully you know it). -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?19974.1092927233>