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Re: [openpgp] Transport public keys inside the message body

Daniel Kahn Gillmor <dkg@fifthhorseman.net> Mon, 19 February 2024 16:10 UTC

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From: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
To: Simon Josefsson <simon@josefsson.org>
Cc: openpgp@ietf.org
In-Reply-To: <87cyswpjxt.fsf@kaka.sjd.se>
References: <1a5e4659-c7a7-4c73-8427-eb391736794e@kuix.de> <0E2C8CD9-310A-48B5-B7F5-E11633DFE611@andrewg.com> <87h6i92rbd.fsf@fifthhorseman.net> <87cyswpjxt.fsf@kaka.sjd.se>
Autocrypt: addr=Daniel Kahn Gillmor; prefer-encrypt=mutual; keydata= xjMEZXEJyxYJKwYBBAHaRw8BAQdA5BpbW0bpl5qCng/RiqwhQINrplDMSS5JsO/YO+5Zi7HCi QQfFgoAMQWCZadnIAUJBdtHCwMLCQcDFQoIApsBAh4BFiEE1HcEDHDCFWpcKYVJu36RAUlea/ cACgkQu36RAUlea/edDQD+M2QjnoEyu/TjI+gRXBpXQ5jCsnnp9FdYhaSSUW/vZ8kBAJByWlj A9aMfVaVrmvgcYw7jzJz+gmZspBRB++5LZ20NzRc8ZGtnQGZpZnRoaG9yc2VtYW4ubmV0PsLA EQQTFgoAeQMLCQdHFAAAAAAAHgAgc2FsdEBub3RhdGlvbnMuc2VxdW9pYS1wZ3Aub3JnEu/CS CeyWwC6j4ihJr2u/z6delsF1pvYW3ufgf1L538DFQoIApsBAh4BFiEE1HcEDHDCFWpcKYVJu3 6RAUlea/cFAmWnX5AFCQXZ8EUACgkQu36RAUlea/cjVwD+ONjdHM74rAa6EEiiqaPjlptiaZx CVqFYXnib6EbZARkBAPnnR8pW8vCBnDXHKu65jNqwF3aH761NaOqqMFfppg8GzjMEZXEJyxYJ KwYBBAHaRw8BAQdAjX25Fq2Q9IUFeHy6yByIQPBnFOedFliuEiCIUzJsENDCwMUEGBYKAS1HF AAAAAAAHgAgc2FsdEBub3RhdGlvbnMuc2VxdW9pYS1wZ3Aub3JnwqKWsw56uoWVLIFcs7ZecJ gwpsSNevWCzbviKQ8yRLUCmwK+oAQZFgoAbwWCZXEJywkQdy0WHjXNS4FHFAAAAAAAHgAgc2F sdEBub3RhdGlvbnMuc2VxdW9pYS1wZ3Aub3JnEIJSOxuw2y/UJmg5M3BLpN0JYjODZpXiEVFu 1byARzMWIQR0vATEPYYIS+hnLAZ3LRYeNc1LgQAAsH8BAKg1C5LK/D7pSkXCD+jfTSP+CqM58 iHLjh4vKhpOKsTJAQCHldtEjxJ1ksPTFgG9HihHH7qc6/wvvLw77ETMpwlrAxYhBNR3BAxwwh VqXCmFSbt+kQFJXmv3BQJlp1+rBQkCF4lgAAoJELt+kQFJXmv3ydsA/2roQZ2Jm/7iUrg/2C5 ClWA/xbvPC31LyMkGGH2/rq8tAP9BgqLuCPnNTVPqeX9+9qqMmaFq7wmvjq5I+yycAw9CDc44 BGVxCcsSCisGAQQBl1UBBQEBB0BZMsRrRaaeFSYMF1ZdfRmVgBriDUIr99eDQ085BK14DgMBC AfCwAYEGBYKAG5HFAAAAAAAHgAgc2FsdEBub3RhdGlvbnMuc2VxdW9pYS1wZ3Aub3JnsazAWX tEHUPmSTmcRZAIsAsNiO8k0hdjsfRlRVipgJgCmwwWIQTUdwQMcMIValwphUm7fpEBSV5r9wU CZadfqwUJAheJYAAKCRC7fpEBSV5r90AjAPwLgY1iKiFJEj32SVD5f721929l79VxQB5FlQss x1n5kQEA6Uct2tPvbB6T7p5KG3Gl+tbi7oJAuxFmpkpW5/N2Owg=
Date: Mon, 19 Feb 2024 10:48:02 -0500
Message-ID: <87plws1mml.fsf@fifthhorseman.net>
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Subject: Re: [openpgp] Transport public keys inside the message body
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On Fri 2024-02-16 15:23:10 +0100, Simon Josefsson wrote:
> Daniel Kahn Gillmor <dkg@fifthhorseman.net> writes:
>
>> OTOH, if the other side *is* capable, i'd like to signal my own
>> capability to them in a way that their tooling can pick up on, but is
>> otherwise invisible to a non-capable user.
>
> Would OpenPGP:'s preference field achieve this?
>
> https://datatracker.ietf.org/doc/html/draft-josefsson-openpgp-mailnews-header#section-3.3

I think it mostly does, except for the certificate distribution itself,
which is what this thread was about -- given either a URL or a key ID
(or fingerprint?) the recipient still has to do some work (including
interacting on the network) to get the certificate in question.

        --dkg

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