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<p class="MsoNormal">In our drafting of the S/MIME BR, we included provision for the ECDH keyUsages (encipherOnly, decipherOnly) used in the Royal-Holloway key escrow scheme – primarily because it is mentioned in the gmail policy at
<a href="https://support.google.com/a/answer/7300887?hl=en&ref_topic=9061730#zippy=%2Cend-entity-certificate">
https://support.google.com/a/answer/7300887?hl=en&ref_topic=9061730#zippy=%2Cend-entity-certificate</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">However, I cannot find evidence that any CA uses the scheme, which in any case is not documented in a RFC and whose requirements may not be fully specified.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The purpose of this email is two-fold:<o:p></o:p></p>
<ol style="margin-top:0in" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Are there any CAs that use the Royal-Holloway key escrow scheme in trusted certificates?<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Would the Google representatives enquire if there is a reason for its inclusion in the gmail policy?<o:p></o:p></li></ol>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Unless those raise questions some new information, we will remove this provision from the draft.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Many thanks, Stephen<o:p></o:p></p>
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