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List:       pgp-keyserver-folk
Subject:    [Pgp-keyserver-folk] Re: meaning of key id
From:       David Shaw <dshaw () jabberwocky ! com>
Date:       2003-05-30 14:57:01
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On Fri, May 30, 2003 at 10:51:12AM -0400, Derek Atkins wrote:
> David Shaw <dshaw@jabberwocky.com> writes:
> 
> > On Sat, May 31, 2003 at 04:25:17AM +1400, Lucas Gonze wrote:
> > > 
> > > Hi all,
> > > 
> > > Can anybody tell me what the meaning of a key id is?  EG, given that I
> > > have 04BC8754 for a key on http://www.keyserver.net/, do other keyservers
> > > use this ID?  How is the ID computed?  I imagine it's a serial number for 
> > > the local keystore and isn't shared with other keystores...
> > 
> > No, it is calculated from the key itself.  A given key will always
> > have the same keyid.  However, more than one key may also have that
> > same keyid.  This is why "long" keyids are sometimes used, which are
> > less likely to collide.  The ultimate keyid is the key fingerprint,
> > which is hugely less likely to collide.
> > 
> > (Speaking about v4/OpenPGP keys here.  The older PGP 2.x keys have
> > some problems in this regard.)
> 
> Although the definition is still correct for PGP 2.x keys...

Oops, yes.  I meant "some problems" with regards to collision
resistance.

David
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