Re: [Trans] Privacy-preserving proof of sct exclusion

On 25 March 2017 at 22:39, Saba Eskandarian <sabae@stanford.edu> wrote:

> Hello,
>
> I'm on the agenda for Tuesday's meeting to share a privacy-preserving
> proof of sct exclusion from a log (I think Eran alluded to this work in a
> message a while ago).
>
> My posted slides will not include many words, so I wanted to share a link
> to the preprint of our academic paper on the subject in case anyone wants
> to read the details there. The paper is targeted at a somewhat different
> audience, but it can be found here: https://arxiv.org/abs/1703.02209
>
> Thanks and looking forward to meeting you all next week!
>

Cool, but I immediately see a problem - you require logs to be in timestamp
order, but they aren't. I can't immediately think of a way to get that
property without also considerably increasing time to inclusion in the log.

That seems undesirable - in fact, we're trying to go the other way, i.e.
reduce time to inclusion, in general.

Also, engineering reality doesn't change, so increasing time to inclusion
is also likely to increase MMD.

Secondly, its interesting, but doesn't seem particularly useful: when an
SCT corresponds to a cert that has not been included, you want to reveal
the cert, not hide it. What you want to hide is who is revealing it.

~saba
>
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