[cabfpub] 回复: Ballot 164 - Certificate Serial Number Entropy

Dean Coclin Dean_Coclin at symantec.com
Tue Jun 28 05:04:43 MST 2016


Voting has not started on this ballot yet. Voting starts after 2200 on 1 July. Please resubmit your vote after that time. This vote will not be counted.

 

Dean Coclin

CA/B Forum Chair

 

From: public-bounces at cabforum.org [mailto:public-bounces at cabforum.org] On Behalf Of zhangyq
Sent: Tuesday, June 28, 2016 4:15 AM
To: Ben Wilson <ben.wilson at digicert.com>
Cc: public <public at cabforum.org>
Subject: [cabfpub] 回复: Ballot 164 - Certificate Serial Number Entropy

 

GDCA votes YES to ballot 164.

 

 原始邮件  

发件人: Ben Wilson< <mailto:ben.wilson at digicert.com> ben.wilson at digicert.com>

收件人: CABFPub< <mailto:public at cabforum.org> public at cabforum.org>

发送时间: 2016年6月24日(周五) 23:17

主题: [cabfpub] Ballot 164 - Certificate Serial Number Entropy

 

Ballot 164 - Certificate Serial Number Entropy

 

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:

 

Statement of intent:

 

As demonstrated in  <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, 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.

 

-- Motion Begins --

 

In Section 1.6.1 of the Baseline Requirements,

 

ADD

 

CSPRNG: A random number generator intended for use in cryptographic system.

 

 

In Section 7.1 of the Baseline Requirements,

 

REPLACE

 

"CAs SHOULD generate non-sequential Certificate serial numbers that exhibit at least 20 bits of entropy."

 

WITH

 

"Effective September 30, 2016, CAs SHALL generate Certificate serial numbers greater than zero (0) containing at least 64 bits of output from a CSPRNG."

 

-- Motion Ends --

 

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.

 

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:  <https://cabforum.org/members/> https://cabforum.org/members/

 

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.

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