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Re: EV-cert: "issuer-specific extension OID"?!

From: Yngve N. Pettersen <yngve@opera.com>
Date: Sat, 28 Jul 2007 19:48:02 -0500
To: "Thomas Roessler" <tlr@w3.org>
Cc: pbaker@verisign.com, public-wsc-wg@w3.org
Message-ID: <op.tv7a6ckrkvaitl@lessa-ii.broadbandhospitality.com>

On Sat, 28 Jul 2007 19:16:34 -0500, Thomas Roessler <tlr@w3.org> wrote:

> The revocation requirement that you raise (and the way it maps to
> different OIDs) is interesting.  Are there any specifications under
> development that would provide for an OID-based revocation protocol?

The revocation would be done out of band, between the root CA and the  
vendor, then the vendor would distribute it to deployed clients through  
some update mechanism. Additionally, if the Root CA falls out of  
compliance (for whatever reason) the vendor would do the same.

The update mechanisms are established by the vendors, and IMO does not  
need to be standardized. The same applies to the communication between the  
vendor and the Root CA.

> Is there any guidance as part of the EV material (I'll admit that I
> still haven't read the CABforum papers in detail) that would include
> your "distinct OIDs" requirement?

No, the only requirement is to have an OID in the subsciber certificate  
that is recognized by the client, and a policy filter in the intermediate  
CAs. There is an obvious minimum of one OID, there is no maximum.

My suggestion may be considered a bit "better safe than sorry", in case a  
renegade sub CA turns out to be untractable. Essentially though, the  
requirement to check CRLs for intermediate CAs takes care of most of the  
issue.

I do expect, however, that each CA will use another OID to indicate  
compliance with a significantly modified specification, if/when such a  
specification is needed.


-- 
Sincerely,
Yngve N. Pettersen

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Received on Sunday, 29 July 2007 00:48:25 GMT

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