Re: Report of collision-generation with MD5

From: Poul-Henning Kamp (phk_at_phk.freebsd.dk)
Date: 08/19/04

  • Next message: Mohacsi Janos: "Re: Report of collision-generation with MD5"
    To: Tig <tigger@onemoremonkey.com>
    Date: Thu, 19 Aug 2004 16:53:53 +0200
    
    

    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.
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