On Tue, Mar 7, 2017 at 1:10 PM, Ben Laurie <[email protected]> wrote:

>
>
> On 3 March 2017 at 19:09, Andrew Ayer <[email protected]> wrote:
>
>> On Fri, 3 Mar 2017 13:24:51 -0500
>> Richard Barnes <[email protected]> wrote:
>> > - A field in an SCT that indicates the canonical STH for the
>> > certificate in question.  Possibly a serial number in STH that SCTs
>> > could refer to.
>>
>> Is this necessary?  Why not define the canonical STH as the first STH
>> issued after the SCT (based on timestamp)?
>>
>
> That doesn't work - the cert may not have been included in the log by then.
>
> That said, not sure how Richard's proposal works, either - in general, the
> front-end that returns the SCT cannot know when the cert will be included,
> and hence cannot predict the relevant STH.
>

Yes, this proposal would require that there be enough coordination between
log ingress and storage that the front-end could know under which STH a
cert would land.  I realize that might not be the case now, but is it
unachievable?

--Richard


> Not entirely sure I agree with the initial premise anyway.
>
>>
>>
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