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Re: [saag] Direct trust between users

Ben Laurie <benl@google.com> Fri, 26 April 2019 08:42 UTC

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From: Ben Laurie <benl@google.com>
Date: Fri, 26 Apr 2019 09:42:10 +0100
Message-ID: <CABrd9SSyAYuQAuBcJhtgQUnsLah88Vbiz+a3BofCZ=XjyMikbQ@mail.gmail.com>
To: Phillip Hallam-Baker <phill@hallambaker.com>
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Subject: Re: [saag] Direct trust between users
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On Wed, 24 Apr 2019 at 18:57, Phillip Hallam-Baker <phill@hallambaker.com>
wrote:

> Nico asked about the Mesh Trust model and I said that I was trying to
> avoid imposing one. I do have metrics for measuring the quality of trust
> established in terms of a work factor however:
>
> http://mathmesh.com/Documents/draft-hallambaker-mesh-trust.html
>
> This is not a computational work factor as we are used to. It is a social
> work factor nominally denominated in currency (USD) and bounded in time.
>
> Let us say that we did some key signing even open to IETF meeting
> attendees only. It would cost an attacker $325 plus travel minimum to
> impersonate me. Not an impossible sum if they really really want to
> impersonate me but enough to stop a large number of attacks. Furthermore,
> there is a significant risk of being caught if they attempt the
> impersonation on any large scale. So the social work factor might be $1000.
>

Presumably $1,000 buys more than one impersonation, and of anyone you want
(there's no list of who was actually at IETF, AFAIK).

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