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Re: [openpgp] To bind or not to bind

Daniel Kahn Gillmor <dkg@fifthhorseman.net> Sat, 23 March 2024 18:51 UTC

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From: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
To: openpgp@ietf.org
In-Reply-To: <87sf0h32d3.fsf@fifthhorseman.net>
References: <87a5mqi0xi.fsf@europ.lan> <23B46D65-EAF7-43D0-A5F1-04D28B698559@andrewg.com> <87sf0h32d3.fsf@fifthhorseman.net>
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: Sat, 23 Mar 2024 14:44:45 -0400
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Subject: Re: [openpgp] To bind or not to bind
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On Sat 2024-03-23 02:10:16 -0400, Daniel Kahn Gillmor wrote:
> I think the "big" mock keys in the Mock PQ Subkey tests are "huge data
> (unrepresentable as MPI)", which aiui means > 8KiB, but the test doesn't
> produce those artifacts for inspection:
>
> https://gitlab.com/sequoia-pgp/openpgp-interoperability-test-suite/-/issues/134
>
> If that's right, then it would put SLH-DSA-SHAKE-128f and
> SLH-DSA-SHAKE-256s out of reach, but all the other proposals would fit.

Wait, i think i got this entirely wrong.  The public keys of SLH-DSA are
actually quite small.  It's the signatures that are large, right?

So perhaps this isn't an issue for any of the algorithms currently
contemplated in draft-ietf-openpgp-pqc. 

I'd appreciate confirmation from people more actively working on the
implementations than me!

Regards,

             --dkg

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