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<H1>[Mageia-dev] PGP keys and package signing</H1>
<B>Michael Scherer</B>
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TITLE="[Mageia-dev] PGP keys and package signing">misc at zarb.org
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<I>Mon Jan 31 20:37:07 CET 2011</I>
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<PRE>Le lundi 31 janvier 2011 à 20:12 +0100, nicolas vigier a écrit :
><i> On Mon, 31 Jan 2011, Michael Scherer wrote:
</I>><i>
</I>><i> > Nope, I didn't say "new unexpired key", but just push the same key, with
</I>><i> > the expiration date extended. That should be painless IIRC ( at least,
</I>><i> > it is for me ).
</I>><i>
</I>><i> Oh, I misunderstood this as I imagined it was not possible to change
</I>><i> expiration date on a key as it would be difficult to check if the change
</I>><i> was done before expiration. But after checking, it is indeed possible,
</I>><i> and it is even possible to do it after the expiration date.
</I>><i>
</I>><i> So we can do it, but we should remember that it does not protect against
</I>><i> a key compromised after it has expired (as someone stealing the key
</I>><i> can change the expiration date even after it has expired).
</I>
But we would notice it, I guess. That could be a good idea to check if
any of our old key do not appear on the keyring with a non expired
date :)
><i> So the only use of expiration date I see is to check that the key was
</I>><i> updated from keyserver recently. Maybe we can set a short expiration
</I>><i> time (15 days ?), and have something in cron to update it a few days
</I>><i> before it expire ?
</I>
Or maybe we can keep the expiration date to indicate when the key should
not be used anymore ( ie, as a indication, nothing more, as we cannot
guarantee anything ), and once the expiration date occurs ( expiration
date set on our copy of the key ), we upload the revocation certificate
( with we == a cronjob , by checking the date of the key )
We could even use this on client side to indicate that a release is no
longer supported. ( ie, DRY principle ).
><i> > > Instead of deciding
</I>><i> > > now that the key will expire in a few years, I would prefer that we look
</I>><i> > > at it in a few years to decide if we want to revoke it.
</I>><i> >
</I>><i> > Wouldn't it be too late ?
</I>><i>
</I>><i> Considering that it is possible to update expiration date even after it
</I>><i> has expired, this expiration date doesn't protect against some technology
</I>><i> that would allow people in the futur to bruteforce the private key.
</I>
It is up to the tool to use or not the expiration. Ie, if we tell to
urpmi "do not trust expired key", we can as well say "keep a list of key
that have expired and never trust a key, even if it say the contrary".
But indeed, that doesn't sound very secure per se :/
--
Michael Scherer
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