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<p>SSC votes: "Yes".</p>
<p>Thanks,</p>
<p>M.D.<br>
</p>
<br>
<div class="moz-cite-prefix">On 6/24/2016 6:17 PM, Ben Wilson wrote:<br>
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<p class="MsoNormal"><b>Ballot 164 - Certificate Serial Number
Entropy<o:p></o:p></b></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">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></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b>Statement of intent:<o:p></o:p></b></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">As demonstrated in <a
moz-do-not-send="true"
href="https://events.ccc.de/congress/2008/Fahrplan/attachments/1251_md5-collisions-1.0.pdf"><a class="moz-txt-link-freetext" href="https://events.ccc.de/congress/2008/Fahrplan/attachments/1251_md5-collisions-1.0.pdf">https://events.ccc.de/congress/2008/Fahrplan/attachments/1251_md5-collisions-1.0.pdf</a></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></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b>-- Motion Begins --<o:p></o:p></b></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">In Section 1.6.1 of the Baseline
Requirements,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">ADD<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">CSPRNG: A random number generator intended
for use in cryptographic system.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">In Section 7.1 of the Baseline
Requirements,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">REPLACE<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">"CAs SHOULD generate non-sequential
Certificate serial numbers that exhibit at least 20 bits of
entropy."<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">WITH<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">"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></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b>-- Motion Ends --<o:p></o:p></b></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">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></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">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 class="moz-txt-link-freetext" href="https://cabforum.org/members/">https://cabforum.org/members/</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">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></p>
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