On Fri, 30 May 2008 02:05:42 +0300
Daniel Iliev <[EMAIL PROTECTED]> wrote:

> On Thu, 29 May 2008 08:38:27 +0000 (UTC)
> [EMAIL PROTECTED] wrote:
> 
> > W. Canis wrote:
> > > OK, I can't bring myself a "proof of concept".
> > 
> > Allow me to help you with that part.
> > 
> > Personally I still think signatures in public mailing lists are
> > overrated.
> > 
> > NOT signed by
> > Some Gentoo user with a security job and 5 minutes of time
> > 
> > P.S. Daniel - I really hope this is ok with you. I took your dare
> > literally for this one time. Your personality won't be abused by me
> > again.
> 
> 
> No problem,..ehh..PSZ, I presume? :)
> 
> It was I who gave the idea and the challenge. Don't worry, it's really
> fine by me.
> 
> I admit I looks very much as if the message was sent by me and could
> be deceiving at first glance, but:
> 
> 
> FAKE:
> ===
> Received: from observed.de (observed.de [81.169.134.89])
>       by pigeon.gentoo.org (Postfix) with ESMTP id AE151E05BC
>       for <gentoo-user@lists.gentoo.org>; Thu, 29 May 2008 08:38:27
> +0000 (UTC)
> ===
> 
> 
> NOT FAKE:
> ===
> Received: from fg-out-1718.google.com (fg-out-1718.google.com
> [72.14.220.153])
>        by pigeon.gentoo.org (Postfix) with ESMTP id 3E5ACE0229
>        for <gentoo-user@lists.gentoo.org>; Mon, 26 May 2008 00:30:07
> +0000 (UTC)
> ===

Except that even that can be faked.

The header is part of the payload, so can be whatever the user decides
to put in, simply fake some a set of relay lines, and how do you know?

Rob.
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