Le samedi 7 décembre 2013 11:11:13 UTC+1, Peter Gutmann a écrit :
> Jeremy Rowley <[email protected]> writes:
> >I think this is a good idea.  Per 5280, the notBefore date is used to
> >indicate the start of the certificate's validity (not the date it was
> >issued). Using a new optional extension for issuance date will avoid causing
> >technical problems with other systems and still let Mozilla enforce the BRs.

Then we'll have another discussion on what to do against the problematic 
practice of backdating this extension.

> Doesn't this extension already exist in the form of the privateKeyUsagePeriod?
> That's actually extremely useful for limiting the exposure of a key, you set
> the pKUP to when the key is active and the validFrom/To the period when you
> can check e.g. a signature generated with the cert.

Has this extension been de-obsoleted? It was already deprecated in RFC2459, 
it's not even present in RFC5280 anymore.
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