On 9/15/13 2:08 PM, "Yaron Sheffer" <[email protected]> wrote:

>Hi Jim,
>
>Wouldn't the following be simpler and more natural than both proposals:
>
>- The organization maintains its own CA, maybe just for S/MIME client
>certs.
>- The CA cert is kept as a DNS record, signed by DANE.
>- The CA cert is usage-limited, so it can be used for S/MIME only, and
>only for addresses at this particular domain. [I suppose this is the
>hard part. Is it allowed by X.509?]

You'd need to write something to limit CA certificates in this manner.
This may just be a matter of writing up processing rules to codify the
recent CAB Forum changes to EKU usage.  


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