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<p class="MsoNormal">CSBR 13.2.1 states: A Certificate MAY have a one-to-one relationship or one-to-many relationship with the signed Code. Regardless, revocation of a Certificate may invalidate the Code Signatures on all signed Code, some of which could be
perfectly sound. Because of this, <span style="background:yellow;mso-highlight:yellow">
the CA MAY specify a revocation date in a CRL</span> or OCSP response to time-bind the set of software affected by the revocation, and software should continue to treat objects containing a timestamp dated before the revocation date as valid.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The CSBRs are referring to “revocation date’, which I believe should be referring to “invalidity date” as specified in RFC 5280,
<a href="https://datatracker.ietf.org/doc/html/rfc5280#section-5.3.2">https://datatracker.ietf.org/doc/html/rfc5280#section-5.3.2</a>.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Note that we need to think of the following dates:<o:p></o:p></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Valid from<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Invalidity date<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Revocation date<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Valid to<o:p></o:p></li></ul>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The purpose of the Invalidity date is to provide a date in the past, when the key was compromised. The revocation date would be on the date that the certificate was revoked and cannot be a past date.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Would there be any objections in changing “revocation date” to “invalidity date” in a future ballot?
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks, Bruce<o:p></o:p></p>
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