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</o:shapelayout></xml><![endif]--></head><body lang=ZH-TW link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=NO-BOK style='color:#1F497D'>Chunghwa Telecom Co., Ltd. votes “Yes” <o:p></o:p></span></p><p class=MsoNormal><span lang=NO-BOK style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=NO-BOK style='color:#1F497D'>Sincerely Yours,<o:p></o:p></span></p><p class=MsoNormal><span lang=NO-BOK style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=NO-BOK style='color:#1F497D'> Li-Chun CHEN<o:p></o:p></span></p><p class=MsoNormal><span lang=NO-BOK style='color:#1F497D'> Deputy Senior Engineer<o:p></o:p></span></p><p class=MsoNormal><span lang=NO-BOK style='color:#1F497D'> CISSP, CISA, CISM, PMP,<o:p></o:p></span></p><p class=MsoNormal><span lang=NO-BOK style='color:#1F497D'> Information & Communication Security Dept.<o:p></o:p></span></p><p class=MsoNormal><span lang=NO-BOK style='color:#1F497D'> Data Communication Business Group<o:p></o:p></span></p><p class=MsoNormal><span lang=NO-BOK style='color:#1F497D'> Chunghwa Telecom Co. Ltd.<o:p></o:p></span></p><p class=MsoNormal><span lang=NO-BOK style='color:#1F497D'> <a href="mailto:realsky@cht.com.tw">realsky@cht.com.tw</a><o:p></o:p></span></p><p class=MsoNormal><span lang=NO-BOK style='color:#1F497D'> +886-2-2344-4820#4025<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><p class=MsoNormal><span lang=EN-US>On 24 Jun 2016, at 8:17 AM, Ben Wilson <<a href="mailto:Ben.Wilson@digicert.com">Ben.Wilson@digicert.com</a>> wrote:<o:p></o:p></span></p></div><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><div><div><p class=MsoNormal><b><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Ballot 164 - Certificate Serial Number Entropy</span></b><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>This ballot has been proposed by Jacob Hoffman-Andrews of Let's Encrypt and endorsed by Ben Wilson of DigiCert and Tim Hollebeek of Trustwave:<o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p></div><div><p class=MsoNormal><b><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Statement of intent:</span></b><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>As demonstrated in<span class=apple-converted-space> </span><a href="https://events.ccc.de/congress/2008/Fahrplan/attachments/1251_md5-collisions-1.0.pdf"><span style='color:#954F72'>https://events.ccc.de/congress/2008/Fahrplan/attachments/1251_md5-collisions-1.0.pdf</span></a>, hash collisions can allow an attacker to forge a signature on the certificate of their choosing. The birthday paradox means that, in the absence of random bits, the security level of a hash function is half what it should be. Adding random bits to issued certificates mitigates collision attacks and means that an attacker must be capable of a much harder preimage attack. For a long time the Baseline Requirements have encouraged adding random bits to the serial number of a certificate, and it is now common practice. This ballot makes that best practice required, which will make the Web PKI much more robust against all future weaknesses in hash functions. Additionally, it replaces "entropy" with "CSPRNG" to make the requirement clearer and easier to audit, and clarifies that the serial number must be positive.<o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p></div><div><p class=MsoNormal><b><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>-- Motion Begins --</span></b><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>In Section 1.6.1 of the Baseline Requirements,<o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>ADD<o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>CSPRNG: A random number generator intended for use in cryptographic system.<o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>In Section 7.1 of the Baseline Requirements,<o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>REPLACE<o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>"CAs SHOULD generate non-sequential Certificate serial numbers that exhibit at least 20 bits of entropy."<o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>WITH<o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>"Effective September 30, 2016, CAs SHALL generate Certificate serial numbers greater than zero (0) containing at least 64 bits of output from a CSPRNG."<o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p></div><div><p class=MsoNormal><b><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>-- Motion Ends --</span></b><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>The review period for this ballot shall commence immediately, and will close at 2200 UTC on 1 July 2016. Unless the motion is withdrawn during the review period, the voting period will start immediately thereafter and will close at 2200 UTC on 8 July 2016. Votes must be cast by posting an on-list reply to this thread.<o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>A vote in favor of the motion must indicate a clear 'yes' in the response. A vote against must indicate a clear 'no' in the response. A vote to abstain must indicate a clear 'abstain' in the response. Unclear responses will not be counted. The latest vote received from any representative of a voting member before the close of the voting period will be counted. Voting members are listed here:<span class=apple-converted-space> </span><a href="https://cabforum.org/members/"><span style='color:#954F72'>https://cabforum.org/members/</span></a><o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>In order for the motion to be adopted, two thirds or more of the votes cast by members in the CA category and greater than 50% of the votes cast by members in the browser category must be in favor. Quorum is currently ten (10) members– at least ten members must participate in the ballot, either by voting in favor, voting against, or abstaining.<o:p></o:p></span></p></div><p class=MsoNormal><span lang=EN-US style='font-size:9.0pt;font-family:"HelveticaNeue","serif"'>_______________________________________________<br>Public mailing list<br></span><span lang=EN-US><a href="mailto:Public@cabforum.org"><span style='font-size:9.0pt;font-family:"HelveticaNeue","serif";color:#954F72'>Public@cabforum.org</span></a></span><span lang=EN-US style='font-size:9.0pt;font-family:"HelveticaNeue","serif"'><br></span><span lang=EN-US><a href="https://cabforum.org/mailman/listinfo/public"><span style='font-size:9.0pt;font-family:"HelveticaNeue","serif";color:#954F72'>https://cabforum.org/mailman/listinfo/public</span></a><o:p></o:p></span></p></div></blockquote></div><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div></body></html><br><html><div><div>本信件可能包含中華電信股份有限公司機密資訊,非指定之收件者,請勿蒐集、處理或利用本信件內容,並請銷毀此信件. 如為指定收件者,應確實保護郵件中本公司之營業機密及個人資料,不得任意傳佈或揭露,並應自行確認本郵件之附檔與超連結之安全性,以共同善盡資訊安全與個資保護責任. </div><div>Please be advised that this email message (including any attachments) contains confidential information and may be legally privileged. 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