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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">I will try to think up some use cases as this doesn’t come up that often. I am not saying that these are applicable to Entrust. However, I do know that since
we need to support many clients and browsers which are continually changing and updating policies, there is a chance that a CA may need some maintenance for best browser ubiquity.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">So some use cases could be certificate expiry, lengthen CA lifetime, add in AIA, mistakenly sign the certificate with the wrong hash, mistakenly sign the certificate
with the wrong pathlength, sign the CA by a different CA, etc.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Please note we have always supported CNs in subordinate CAs. Our software does not support unique CNs for subordinate CA certificates.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">I am also open to discuss bad results and security issues, but am hoping we can discuss those as a separate discussion.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Thanks, Bruce.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Ryan Sleevi [mailto:sleevi@google.com]
<br>
<b>Sent:</b> Wednesday, April 26, 2017 2:20 PM<br>
<b>To:</b> Bruce Morton <Bruce.Morton@entrustdatacard.com><br>
<b>Cc:</b> CA/Browser Forum Public Discussion List <public@cabforum.org>; Gervase Markham <gerv@mozilla.org><br>
<b>Subject:</b> Re: [cabfpub] [EXTERNAL]Re: Ballot 199 - Require commonName in Root and Intermediate Certificates<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Wed, Apr 26, 2017 at 2:17 PM, Bruce Morton <<a href="mailto:Bruce.Morton@entrustdatacard.com" target="_blank">Bruce.Morton@entrustdatacard.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Our software does not support change the identity of a CA when you issue it a new certificate. I assume
that this is similar issuing passports. When an individual gets a passport they put their identity in the passport, when they renew their passport, they use the same identity.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal">Right, apologies I wasn't clearer - what's the use case for 'renewing' an intermediate? What functionality are you achieving versus, say, naming it as a new intermediate?<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">We do use CNs for subordinate CAs and the CNs are unique per CA. We do not use unique CNs per CA certificate.
</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Please also note that the unique CN is also for a unique private key.</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Right, that's the bit of unnecessary complexity that I think is harmful (and can think of a variety of situations where it's caused a Bad Result for Security).<o:p></o:p></p>
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