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Re: [openpgp] To bind or not to bind

Daniel Kahn Gillmor <dkg@fifthhorseman.net> Sat, 23 March 2024 03:59 UTC

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From: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
To: Justus Winter <justus@sequoia-pgp.org>, Aron Wussler <aron@wussler.it>, "openpgp@ietf.org" <openpgp@ietf.org>
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References: <EGivTgyfjNm_TAvhds1OPA2c0O6LP9lFnkwWHHKLJY8ReJOgtDh3tnYsCSR8yrrBLbpeehtUgIJEhynae8L3daRimNiGO7BAb3cVvC66q-4=@wussler.it> <87a5mqi0xi.fsf@europ.lan>
Autocrypt: addr=dkg@fifthhorseman.net; 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: Fri, 22 Mar 2024 23:46:00 -0400
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Subject: Re: [openpgp] To bind or not to bind
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On Fri 2024-03-22 19:19:53 +0100, Justus Winter wrote:
>>  (2) Whether PQC encryption algorithms can be used only with SEIPDv2
>
> No, don't bind PQC encryption to SEIPDv2.  It should be possible to have
> a "PKESKv3(classical) PKESKv6(PQC) SEIPDv1" message:

I don't think this packet sequence is correct.  In particular, the PKESK
version is bound to the following SEIPD version, *not* to the key
version.

In this case, i believe the right outcome would be:

   PKESKv3(classical) PKESKv3(PQC) SEIPDv1

see 
https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-13.html#section-10.3.2.1-2
for more details.

        --dkg

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