Re: pgp signing in van
Melinda Shore <melinda.shore@gmail.com> Sat, 07 September 2013 02:36 UTC
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Date: Fri, 06 Sep 2013 18:35:49 -0800
From: Melinda Shore <melinda.shore@gmail.com>
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To: Ted Lemon <ted.lemon@nominum.com>
Subject: Re: pgp signing in van
References: <m2zjrq22wp.wl%randy@psg.com> <2309.1378487864@sandelman.ca> <522A5A45.7020208@isi.edu> <CA2A6416-7168-480A-8CE1-FB1EB6290C77@nominum.com> <522A71A5.6030808@gmail.com> <6DE840CA-2F3D-4AE5-B86A-90B39E07A35F@nominum.com> <CAPv4CP_ySqyEa57jUocVxX6M6DYef=DDdoB+XwmDMt5F9eGn1A@mail.gmail.com> <A6B01C4B-B59A-49FD-9524-D49F85750BF7@nominum.com>
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On 9/6/13 6:24 PM, Ted Lemon wrote: > It's naive to think that keys are any more trustworthy than this, > because any signature's trustworthiness is only as good as the > trustworthiness of the individual who decides to sign it. If you > trust a key signed by someone you don't know, but who someone you > know trusts, just how trustworthy is that? I actually don't think that pgp is likely to be particularly useful as a "serious" trust mechanism, mostly because of issues like this. I don't believe that it's an argument for less rigor in how we assign trust to signatures but rather an example of several underlying problems, including lack of agreement about what it actually means to sign something, acknowledgment that you don't know much about how the people whose keys you're signing think about trust ("My friends are fine but some of their friends are jerks"), etc. One of the useful things that PKI provides is some agreement, at least, about what we expect from certification authorities and what it means to issue and sign a certificate. That is to say, the semantics are reasonably well sorted-out, which is not the case with pgp. Melinda
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