"and required by EV" ?

Eddy, the EV Guidelines impose certain requirements on Intermediate CAs *when* 
they are used, but AFAIK they don't mandate that Intermediate CAs MUST be 
used.

Visit https://www.securetrust.com in FF3 for an example of an EV-enabled Root 
Certificate (CN = SecureTrust CA) that issues EV SSL Certificates without 
involving any Intermediate CA(s) in the certificate chain.

On Monday 12 January 2009 10:28:42 Eddy Nigg wrote:
> On 01/12/2009 11:56 AM, Jean-Marc Desperrier:
> > Eddy Nigg wrote:
> >> [...] No exception can be added for revoked certificates, but for
> >> expired ones it's possible - hence it suggests that revocation is more
> >> severe than expired (if one can think in those terms). Or how would you
> >> explain that?
> >
> > As I have already found myself in the situation of really needing to
> > override an expired certificate, I beg to differ and find an explanation.
> >
> > In the case of revoked certificates, you have positive proof that the CA
> > wants that cert to be revoked.
>
> Indeed! That was the point I was trying to make (and why i believe that
> expired but revoked certificates should never be removed from the CRL).
> Considering that intermediate CAs are more and more common and the
> encouraged practice anyway (and required by EV), those CRLs shouldn't
> grow that badly until the issuing CA certificate expires. As Julien also
> mentioned, some CAs keep the revoked certs for a period of N years in
> the CRL - with intermediates assumed limited life-time, we aren't really
> far from that.
>
> > In the case of expired certificates, you just don't know. So it leave
> > the possibility that you have out of band information that the key is
> > not compromised and that you should be able to access the site.
>
> Yes, I view an expired certificate differently than a revoked one. There
> are indeed situations which require to access a site with an expired cert.

-- 
Rob Stradling
Senior Research & Development Scientist
Comodo - Creating Trust Online
Office Tel: +44.(0)1274.730505
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