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Re: [perpass] OpenPGP mail/news header

Simon Josefsson <simon@josefsson.org> Thu, 28 August 2014 19:26 UTC

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From: Simon Josefsson <simon@josefsson.org>
To: Paul Wouters <paul@nohats.ca>
References: <20140828160043.76ae962f@latte.josefsson.org> <alpine.LFD.2.10.1408281046090.17182@bofh.nohats.ca>
OpenPGP: id=54265E8C; url=http://josefsson.org/54265e8c.txt
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Date: Thu, 28 Aug 2014 21:26:15 +0200
In-Reply-To: <alpine.LFD.2.10.1408281046090.17182@bofh.nohats.ca> (Paul Wouters's message of "Thu, 28 Aug 2014 10:54:20 -0400 (EDT)")
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Subject: Re: [perpass] OpenPGP mail/news header
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Paul Wouters <paul@nohats.ca> writes:

> On Thu, 28 Aug 2014, Simon Josefsson wrote:
>
>> I have updated a six (!) year old document describing the OpenPGP
>> mail/news header field.  As it encourages and promotes use of
>> encrypted/signed email, I thought it would be relevant to this list.
>> All feedback is appreciated, either directly to me or here.
>>
>> http://tools.ietf.org/html/draft-josefsson-openpgp-mailnews-header-07
>
> I think it would be better to announce both keyid and fingerprint.
>
> Would it be better to use the longer keyid version?

Both key id and full fingerprint are permitted.

> Should a warning be added to the Security Considerations about v3 keys
> being vulnerable to forging of fingerprints?
> See: https://github.com/coruus/cooperpair/tree/master/keysteak

There is already the following text:

   Version 3 OpenPGP keys can be created with a chosen key id (aka "the
   0xDEADBEEF attack").  Verifying the Key ID of a retrieved key against
   the one provided in the field is thus not sufficient to protect
   against a man-in-the-middle attack.  Instead, the web-of-trust
   mechanism should be used.

> It would be nice to support OPENPGPKEY DNS records in header as well?
>
> either:
>
> OpenPGP: dns:paul@nohats.ca
>
> or
>
> OpenPGP:
> dns=ab16de0656382d91838914109ab89a0a4e04321550a1a20ace7a8b66._openpgpkey.nohats.ca

Should already be supported through RFC 4501, or am I missing something?

OpenPGP: id=12345678; url=dns:ab16de0656382d91838914109ab89a0a4e04321550a1a20ace7a8b66._openpgpkey.nohats.ca?TYPE=OPENPGPKEY

OpenPGP: id=12345678; url=dns:simon.josefsson.org?TYPE=CERT

> Perhaps add a reference to:
>
> http://tools.ietf.org/html/draft-wouters-dane-openpgp

Please propose some text to give the reference some context, and I'll
consider it. :-)

/Simon

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