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<H1>[Mageia-dev] PGP keys and package signing</H1>
<B>Pascal Terjan</B>
<A HREF="mailto:mageia-dev%40mageia.org?Subject=Re%3A%20%5BMageia-dev%5D%20PGP%20keys%20and%20package%20signing&In-Reply-To=%3CAANLkTi%3DnufoGktW%2BycrwUL4QENS5-0oAF-LoNzwsdzp2%40mail.gmail.com%3E"
TITLE="[Mageia-dev] PGP keys and package signing">pterjan at gmail.com
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<I>Tue Feb 1 11:47:46 CET 2011</I>
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<PRE>On Tue, Feb 1, 2011 at 00:35, Dick Gevers <<A HREF="https://www.mageia.org/mailman/listinfo/mageia-dev">dvgevers at xs4all.nl</A>> wrote:
><i> On Tue, 01 Feb 2011 00:15:36 +0100, Michael Scherer wrote about Re:
</I>><i> [Mageia-dev] PGP keys and package signing:
</I>><i>
</I>>><i>Le lundi 31 janvier 2011 à 21:49 +0000, Dick Gevers a écrit :
</I>>>><i> On Mon, 31 Jan 2011 17:18:25 +0100, Michael Scherer wrote about Re:
</I>>>><i> [Mageia-dev] PGP keys and package signing:
</I>>>><i>
</I>>>><i> >The problem is not leaking the key, it is about cryptographic attacks
</I>>>><i> >about older keys.
</I>>>><i> >
</I>>>><i> >If in 10 years, there is some technology that allows people to get our
</I>>>><i> >private key by bruteforce on the public one
</I>>>><i>
</I>>>><i> You can never ever obtain the private key from the public one, that is
</I>>>><i> impossible. It can only be compromised if someone looses the private key
</I>>>><i> plus the password is cracked.
</I>>><i>
</I>>><i>Some secure systems have been seen compromised ( like
</I>>><i><A HREF="http://www.win.tue.nl/hashclash/rogue-ca/,">http://www.win.tue.nl/hashclash/rogue-ca/,</A> who explain how the whole SSL
</I>>><i>business was compromised 2 years ago, or see the GSM being cracked at
</I>>><i>this year 27C3 ).
</I>>><i>
</I>>><i>And Debian also got ride of older vulnerable gpg keys ( see
</I>>><i><A HREF="http://lists.debian.org/debian-devel-announce/2010/04/msg00018.html">http://lists.debian.org/debian-devel-announce/2010/04/msg00018.html</A> and
</I>>><i><A HREF="http://lists.debian.org/debian-devel-announce/2010/09/msg00003.html">http://lists.debian.org/debian-devel-announce/2010/09/msg00003.html</A> ),
</I>>><i>so I would not be so optimistic about the "never".
</I>>><i>
</I>>><i>Technically, MD5 should not have been reversible, but see how easy it is
</I>>><i>using a rainbow table. Granted, that's a 20 year protocol, but that's
</I>>><i>still widely used in lots of software.
</I>><i>
</I>><i> Sorry, but I am not convinced: the gpg key we are talking about consists of
</I>><i> 2 parts: the private key is separate from the public key, or signing key.
</I>><i> The signing key is a separate or subkey and does not contain any part of the
</I>><i> private key. So you can throw any amount of computing power at it, but
</I>><i> there is nothing inside the public key that will enable the rebuilding of
</I>><i> the private key from it.
</I>
Encrypt stuff with the public one, try to decrypt it with the 2^4096
(or whatever) possible private keys.
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