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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Thomas,<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'>The paragraph you quoted:<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'>A CA may specify that an OCSP client can trust a responder for the<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> lifetime of the responder's certificate. The CA does so by<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> including the extension id-pkix-ocsp-nocheck. This SHOULD be a<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> non-critical extension. The value of the extension SHALL be NULL.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> CAs issuing such a certificate should realize that a compromise of<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> the responder's key is as serious as the compromise of a CA key<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> used to sign CRLs, at least for the validity period of this<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> certificate….<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'>does not *<b>require</b>* the CA to use id-pkix-ocsp-nocheck. It starts with “A CA *<b>may</b>* specify…” You don’t have to use it.<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'>-Rick<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><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal style='margin-left:.5in'><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> questions-bounces@cabforum.org [mailto:questions-bounces@cabforum.org] <b>On Behalf Of </b>Thomas Kopp<br><b>Sent:</b> Monday, October 27, 2014 8:12 AM<br><b>To:</b> </span><span style='font-size:10.0pt;font-family:"MS UI Gothic","sans-serif"'>王文正</span><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>; public@cabforum.org; questions@cabforum.org<br><b>Subject:</b> Re: [cabfquest] Question concerning CAB Forum OCSP Requirments<o:p></o:p></span></p></div></div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Dear Wen-Cheng,<o:p></o:p></span></p><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>We have well understood the wording of the RFC. However, our goal is to completely avoid issuing responder certificates containing the id-pkix-ocsp-nocheck extension because even with a short life time of a responder certificate we consider such an approach as an unnecessary lowering of security. <o:p></o:p></span></p><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>In addition, I’m not sure whether you are aware what issuance of an OCSP responder certificates within hours means in practice. Such a rule seems a bit far away from reality because it requires key ceremonies charging a couple responsible people for several hours.<o:p></o:p></span></p><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Finally, our question concerning the motivation behind the requirement has not been answered yet.<o:p></o:p></span></p><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal style='mso-margin-top-alt:1.9pt;margin-right:14.05pt;margin-bottom:0in;margin-left:.5in;margin-bottom:.0001pt;text-autospace:none'><span lang=DE-LU style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#1F497D'>Bescht Gréiss, meilleures salutations, mit freundlichen Grüßen, with best regards,<o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:1.9pt;margin-right:14.05pt;margin-bottom:0in;margin-left:.5in;margin-bottom:.0001pt;text-autospace:none'><b><span lang=DE-LU style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#C00000'><o:p> </o:p></span></b></p><p class=MsoNormal style='mso-margin-top-alt:1.9pt;margin-right:14.05pt;margin-bottom:0in;margin-left:.5in;margin-bottom:.0001pt;text-autospace:none'><b><span lang=EN-GB style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#C00000'>Thomas KOPP <o:p></o:p></span></b></p><p class=MsoNormal style='mso-margin-top-alt:1.9pt;margin-right:14.05pt;margin-bottom:0in;margin-left:.5in;margin-bottom:.0001pt;text-autospace:none'><span lang=EN-GB style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#1F497D'>Head of Information Technologies</span><span lang=EN-GB style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p><p class=MsoNormal style='margin-left:.5in;text-autospace:none'><span lang=DE style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#C00000'>P:<span style='letter-spacing:-.65pt'> </span></span><span lang=DE style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#1F497D'>+352 26 68 15-574 - 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Confidentiality of e-mails can only be guaranteed if they are encrypted properly using a secure digital certificate.LuxTrust S.A. takes precautions to ensure that e-mails are scanned for viruses but cannot accept liability for any damage sustained as a result of software viruses.<o:p></o:p></span></p><p class=MsoNormal style='margin-left:.5in'><a href="https://www.luxtrust.lu/"><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;text-decoration:none'><img border=0 width=414 height=126 id="_x0000_i1025" src="cid:image001.jpg@01CFF1EC.FC0E3880" alt="Email_banner_CSS_like"></span></a><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p></div><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal style='margin-left:.5in'><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> </span><span style='font-size:10.0pt;font-family:"MS UI Gothic","sans-serif"'>王文正</span><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> [<a href="mailto:wcwang@cht.com.tw">mailto:wcwang@cht.com.tw</a>] <br><b>Sent:</b> Méindeg 27 Oktober 2014 15:49<br><b>To:</b> Thomas Kopp; <a href="mailto:public@cabforum.org">public@cabforum.org</a>; <a href="mailto:questions@cabforum.org">questions@cabforum.org</a><br><b>Subject:</b> Re: [cabfquest] Question concerning CAB Forum OCSP Requirments<o:p></o:p></span></p></div></div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p><div><p class=MsoNormal style='margin-left:.5in'>Thomas,<o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>The CAB forum does not impose any high risk on trust service providers or relying parties. You misquote the text, please read the full paragraph in the RFC.<o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>The intention of the text you highlighted in yellow color is to remind CAs that it is dangrous if the lifetime of a 'nocheck' OCSP responder's certificate is too long. That is why the subsequent text says "CAs may choose to issue this type of certificate with a very short lifetime and renew it frequently."<o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>The RFC is intent to tell CAs that it will be safe if they keep the lifetime of a 'nocheck' OCSP responder's certificate very short. In a typical implemention, the lifetime might range from several hours to several days.<o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>Wen-Cheng Wang<o:p></o:p></p></div><p class=MsoNormal style='mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:.5in'><br><br><br>-------- <span style='font-family:"MS Mincho"'>原始郵件</span> --------<br><span style='font-family:"MS Mincho"'>自：</span> Thomas Kopp <<a href="mailto:thomas.kopp@luxtrust.lu">thomas.kopp@luxtrust.lu</a>> <br><span style='font-family:"MS Mincho"'>日期：</span> <br><span style='font-family:"MS Mincho"'>至：</span> <a href="mailto:public@cabforum.org,questions@cabforum.org">public@cabforum.org,questions@cabforum.org</a> <br><span style='font-family:"MS Mincho"'>主旨：</span> [cabfquest] Question concerning CAB Forum OCSP Requirments <o:p></o:p></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'>Dear all,<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'>Can you please clarify the subsequent point?<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'>In the CAB baseline requirements <a href="https://cabforum.org/wp-content/uploads/Baseline_Requirements_V1_1_9.pdf" target="_BLANK">https://cabforum.org/wp-content/uploads/Baseline_Requirements_V1_1_9.pdf</a> section 13.2.5 imposes the id-pkix-ocsp-nocheck extension in the case of an authorized responder scenario.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'>By contrast, RFC 2560 and the successor RFC 6960 stipulate (cf. section 4.2.2.2.1):<o:p></o:p></p><pre style='margin-left:.5in'>A CA may specify that an OCSP client can trust a responder for the<o:p></o:p></pre><pre style='margin-left:.5in'> lifetime of the responder's certificate. The CA does so by<o:p></o:p></pre><pre style='margin-left:.5in'> including the extension id-pkix-ocsp-nocheck. This SHOULD be a<o:p></o:p></pre><pre style='margin-left:.5in'> non-critical extension. The value of the extension SHALL be NULL.<o:p></o:p></pre><pre style='margin-left:.5in'> <span style='background:yellow'>CAs issuing such a certificate should realize that a compromise of</span><o:p></o:p></pre><pre style='margin-left:.5in'><span style='background:yellow'> the responder's key is as serious as the compromise of a CA key</span><o:p></o:p></pre><pre style='margin-left:.5in'><span style='background:yellow'> used to sign CRLs, at least for the validity period of this</span><o:p></o:p></pre><pre style='margin-left:.5in'><span style='background:yellow'> certificate</span>….<o:p></o:p></pre><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'>How can CAB Forum impose such a requirement, which imposes to trust service providers such a high security risk?<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'>Please provide us a reasonable explanation for this particular requirement. Please note that we would not want to hear any technical reasoning like possible “self-looping” during OCSP responder certificate status checking, because such issues can perfectly be addressed without having to lower security.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-right:14.05pt;margin-left:.5in;text-autospace:none'><span lang=DE-LU style='font-size:8.0pt;font-family:"Arial","sans-serif"'>Bescht Gréiss, meilleures salutations, mit freundlichen Grüßen, with best regards,</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-right:14.05pt;margin-left:.5in;text-autospace:none'><b><span lang=DE-LU style='font-family:"Arial","sans-serif";color:#C00000'> </span></b><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-right:14.05pt;margin-left:.5in;text-autospace:none'><b><span lang=EN-GB style='font-family:"Arial","sans-serif";color:#C00000'>Thomas KOPP </span></b><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-right:14.05pt;margin-left:.5in;text-autospace:none'><span lang=EN-GB style='font-size:8.0pt;font-family:"Arial","sans-serif"'>Head of Information Technologies</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in;text-autospace:none'><span lang=DE style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#C00000'>P:<span style='letter-spacing:-.65pt'> </span></span><span lang=DE style='font-size:8.0pt;font-family:"Arial","sans-serif"'>+352 26 68 15-574 - 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