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List:       freebsd-security
Subject:    Re: MD5 Collisions...
From:       Norberto Meijome <freebsd () meijome ! net>
Date:       2007-12-05 1:44:45
Message-ID: 20071205124445.792e8fd5 () meijome ! net
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On Tue, 04 Dec 2007 13:43:39 +0100
Iang <iang@iang.org> wrote:

> Perhaps, 1st two paras:
> 
> 
> ==============
> Md5 is a cryptographic message digest algorithm.  It takes 
> as input a message of arbitrary length and produces as 
> output a 128-bit ``fingerprint'' or ``digest'' of the input. 
>   Such algorithms are intended for applications where a 
> large file must be ``compressed'' in a secure manner, 
> suitable as a digital signature or as an input to a 
> public-key cryptosystem for digital signature or encryption 
> purposes.
> 
> MD5 is no longer recommended as a cryptographic message 
> digest algorithm, although it functions very well as a big 
> checksum.  It is now feasible (2004) to produce two messages 
> having the same MD5 message digest (``collision'' attack), 
> and attacks of this nature are getting better and faster. 
> It is still conjectured to be computationally infeasible 
> (2007) to produce any message having a given prespecified 
> target message digest (``preimage'' attack).
> ==============
> 
> 
> 
> It's worth checking carefully ... discussing the minutiae of 
> cryptographic algorithms is like angels dancing on a pin.

thanks Iang - looks good to me.

btw, i just checked man 3 md5 , and it may need updating - it refers to 1999..
"
 MD5 has not yet (1999-02-11) been broken, but sufficient attacks
     have been made that its security is in some doubt....
"
B


_________________________
{Beto|Norberto|Numard} Meijome

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