full-disclosure - Re: selling office 2003 & 2007 0day

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Message-ID: <8a6b8e350707170853q1367c286qece41be9f2aa86ff@mail.gmail.com>
Date: Tue, 17 Jul 2007 08:53:14 -0700
From: "James Matthews" <nytrokiss@...il.com>
To: "Valdis.Kletnieks@...edu" <Valdis.Kletnieks@...edu>
Cc: full-disclosure@...ts.grok.org.uk, Pieter de Boer <pieter@...darkside.nl>
Subject: Re: selling office 2003 & 2007 0day

If he got a dollar every time someone says he has 0-days to sell we would be
bossing bill gates around (as if we aren't now =)! )

On 7/17/07, Valdis.Kletnieks@...edu <Valdis.Kletnieks@...edu> wrote:
>
> On Mon, 16 Jul 2007 21:12:04 +0200, Pieter de Boer said:
>
> > Ohwell, signing with public keys is pointless anyhow.. *whistles
> innocently*
>
> Signing it with the *recipient's* public key can be somewhat interesting,
> as
> it results in a signature that only the recipient can identify - if
> anybody
> else tries to verify it, they can't, which results in a
> mostly-repudiatable
> signature.
>
> Of course, the *usual* use case is to either:
>
> *encrypt* with the recipients public key (so only their private key can
> decrypt
> it), and then sign the whole thing with your private key (so they can
> verify
> you did it by using your public key).  This results in something that
> anybody
> can verify you sent, but only the recipient can read.  or...
>
> Sign with your private key, then encrypt with their public key - at that
> point
> only the recipient can decode it.  In addition, only the recipient can see
> the
> (now-decoded) signature and verify it.
>
>
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