Having a key ID is an optimization.  If you're using public key
signatures is having to do potentially 3x the signatures going to be a
problem?   

> -----Original Message-----
> From: oauth-boun...@ietf.org [mailto:oauth-boun...@ietf.org] 
> On Behalf Of Brian Eaton
> Sent: Tuesday, June 22, 2010 9:43 AM
> To: Dick Hardt; hannes.tschofe...@gmx.net
> Cc: OAuth WG
> Subject: Re: [OAUTH-WG] proposal for signatures
> 
> On Tue, Jun 22, 2010 at 7:17 AM, Dick Hardt 
> <dick.ha...@gmail.com> wrote:
> >> Thanks for writing this. A few questions...
> >>
> >> Do we need both `issuer` and `key_id`? Shouldn't we use 
> `client_id` 
> >> instead at least for OAuth?
> >
> > it is the ID of the key, not the client -- used to rollover keys
> 
> I don't think key id is necessary, but adding Hannes since he 
> called me crazy for saying that at IIW. =)
> 
> The average client is going to have very few keys.  Probably just 1.
> 3 at the outside.
> 
> If a server needs to verify, it can literally iterate over 
> all of the keys associated with the client until it finds the 
> right one.
> 
> There is some precedent for this approach:
> http://support.microsoft.com/kb/906305/en-us.
> 
> Cheers,
> Brian
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