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<div><span></span>CNNIC votes Yes.</div><div><br></div><div>Best Regards,</div><div>Vicky</div><hr style="width: 210px; height: 1px;" color="#b5c4df" size="1" align="left">
<div><span><div style="MARGIN: 10px; FONT-FAMILY: verdana; FONT-SIZE: 10pt"><div>cab@cnnic.cn</div></div></span></div><blockquote style="margin-top: 0px; margin-bottom: 0px; margin-left: 0.5em;"><div><div class="FoxDiv20160708175520033892"><div class="WordSection1" style="page: WordSection1;">
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<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> <a href="mailto:public-bounces@cabforum.org" style="color: rgb(5, 99, 193); text-decoration: underline;">
public-bounces@cabforum.org</a> [<a href="mailto:public-bounces@cabforum.org" style="color: rgb(5, 99, 193); text-decoration: underline;">mailto:public-bounces@cabforum.org</a>]
<b>On Behalf Of </b>Ben Wilson<br>
<b>Sent:</b> Friday, June 24, 2016 9:18 AM<br>
<b>To:</b> CABFPub <<a href="mailto:public@cabforum.org" style="color: rgb(5, 99, 193); text-decoration: underline;">public@cabforum.org</a>><br>
<b>Subject:</b> [cabfpub] Ballot 164 - Certificate Serial Number Entropy<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><b><span lang="EN-US">Ballot 164 - Certificate Serial Number Entropy<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang="EN-US">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>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><b><span lang="EN-US">Statement of intent:<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang="EN-US">As demonstrated in <a href="https://events.ccc.de/congress/2008/Fahrplan/attachments/1251_md5-collisions-1.0.pdf" style="color: rgb(5, 99, 193); text-decoration: underline;">
https://events.ccc.de/congress/2008/Fahrplan/attachments/1251_md5-collisions-1.0.pdf</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>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><b><span lang="EN-US">-- Motion Begins --<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang="EN-US">In Section 1.6.1 of the Baseline Requirements,<o:p></o:p></span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang="EN-US">ADD<o:p></o:p></span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang="EN-US">CSPRNG: A random number generator intended for use in cryptographic system.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang="EN-US">In Section 7.1 of the Baseline Requirements,<o:p></o:p></span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang="EN-US">REPLACE<o:p></o:p></span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang="EN-US">"CAs SHOULD generate non-sequential Certificate serial numbers that exhibit at least 20 bits of entropy."<o:p></o:p></span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang="EN-US">WITH<o:p></o:p></span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang="EN-US">"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>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><b><span lang="EN-US">-- Motion Ends --<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang="EN-US">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>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang="EN-US">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:
<a href="https://cabforum.org/members/" style="color: rgb(5, 99, 193); text-decoration: underline;">https://cabforum.org/members/</a><o:p></o:p></span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span lang="EN-US">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>
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