Re: [Trans] Precertificate format

"Hill, Brad" <bhill@paypal.com> Tue, 09 September 2014 19:59 UTC

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From: "Hill, Brad" <bhill@paypal.com>
To: Stephen Kent <kent@bbn.com>
Thread-Topic: [Trans] Precertificate format
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Date: Tue, 9 Sep 2014 19:59:02 +0000
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Subject: Re: [Trans] Precertificate format
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Stephen,

Below was your original question, which I've attempted to answer in as straightforward a manner as possible, including illustrative examples from recent history.  Detecting mis-issuance of certificates through public logging of such is the stated goal of the I-D.  The complex nature of X.509/PKIX and the surrounding technology ecosystem and the history of vulnerabilities in such demonstrates that including everything in the log except that which MUST be excluded furthers that goal.  There is not a specific threat model nor any need to articulate one.  We desire a technology that is useful against as many threats to the broad certificate ecosystem as possible, including those yet to be formally anticipated.

-Brad

On Sep 8, 2014, at 4:45 PM, Hill, Brad <bhill@paypal.com> wrote:

>> I suggest that the CT designers list which data items from a cert that is being
>> logged need to be in the SCT request, and why each item has to be present. Maybe that
>> will show us how to avoid the concern that I and others have raised. It would also
>> provide us with a starting point for the format of a new data structure for the SCT
>> request, and the set of data that is input to the SCT hash computation.