Copy and paste error:  Amend  that diagram:
<cert b>
Issuer : Issuer B
Subject: This Responder
Extended Key Usage: OCSP-Signing
</cert b>


On Thu, 2002-03-28 at 13:16, Rick Ziegler wrote:
> One example where multiple certification is needed is an OCSP responder
> that responds for multiple CAs, and whose relying parties expect
> responses to indicate that the CA has delegated the authority to that
> responder.
> 
> Because an OCSP response may only be signed by a single key, a response
> that includes information from multiple CAs must be signed by a key
> certified by each of those CAs.  See the crude diagram below:
> 
> <OCSP request>
> Issuer A, Serial 1?
> Issuer B, Serial 5?
> </OCSP request>
> 
> <OCSP Response>
> Issuer A, Serial 1 : GOOD
> Issuer B, Serial 5 : GOOD
> /signature/
> <optional certs>
> <cert a>
> Issuer : Issuer A
> Subject: This Responder
> Extended Key Usage: OCSP-Signing
> </cert a>
> <cert b>
> Issuer : Issuer A
> Subject: This Responder
> Extended Key Usage: OCSP-Signing
> </cert b>
> </optional certs>
> 
> Hope that helps!
> 
> On Thu, 2002-03-28 at 08:40, Chandu wrote:
> > Hi,
> > 
> > I have a query regarding the Certificates public key.
> > 
> > Is it possible according to PKI standards to get more than one certificate
> > from different CA's for the same public key?
> > 
> > I feel theoritically it is possible.  But I do not know how practical it is.
> > 
> > If this is possible can some one give the practical situation of where it
> > can be used?  If not why it should not be allowed.
> > 
> > I would like to have some comments and feeback on this issue.
> > 
> > Regards
> > Suram
> > 
> > ______________________________________________________________________
> > OpenSSL Project                                 http://www.openssl.org
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> -- 
> Richard Ziegler
> Software Engineer / ClearCase Administrator
> (617) 503-0442
> CertCo, Inc.   
> 
> ______________________________________________________________________
> OpenSSL Project                                 http://www.openssl.org
> User Support Mailing List                    [EMAIL PROTECTED]
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-- 
Richard Ziegler
Release Engineer / ClearCase Administrator
(617) 503-0442
CertCo, Inc.   

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