Re: [openpgp] [RFC4880bis PATCH] Drop "Compatibility Profiles" section.

Daniel Kahn Gillmor <dkg@fifthhorseman.net> Thu, 29 April 2021 16:02 UTC

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From: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
To: Paul Wouters <paul@nohats.ca>, =?utf-8?Q?=C3=81ngel?= <angel@16bits.net>
Cc: openpgp@ietf.org
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Autocrypt: addr=dkg@fifthhorseman.net; prefer-encrypt=mutual; keydata= mDMEX+i03xYJKwYBBAHaRw8BAQdACA4xvL/xI5dHedcnkfViyq84doe8zFRid9jW7CC9XBiI0QQf FgoAgwWCX+i03wWJBZ+mAAMLCQcJEOCS6zpcoQ26RxQAAAAAAB4AIHNhbHRAbm90YXRpb25zLnNl cXVvaWEtcGdwLm9yZ/tr8E9NA10HvcAVlSxnox6z62KXCInWjZaiBIlgX6O5AxUKCAKbAQIeARYh BMKfigwB81402BaqXOCS6zpcoQ26AADZHQD/Zx9nc3N2kj13AUsKMr/7zekBtgfSIGB3hRCU74Su G44A/34Yp6IAkndewLxb1WdRSokycnaCVyrk0nb4imeAYyoPtBc8ZGtnQGZpZnRoaG9yc2VtYW4u bmV0PojRBBMWCgCDBYJf6LTfBYkFn6YAAwsJBwkQ4JLrOlyhDbpHFAAAAAAAHgAgc2FsdEBub3Rh dGlvbnMuc2VxdW9pYS1wZ3Aub3JnL0Gwxvypz2tu1IPG+yu1zPjkiZwpscsitwrVvzN3bbADFQoI ApsBAh4BFiEEwp+KDAHzXjTYFqpc4JLrOlyhDboAAPkXAP0Z29z7jW+YzLzPTQML4EQLMbkHOfU4 +s+ki81Czt0WqgD/SJ8RyrqDCtEP8+E4ZSR01ysKqh+MUAsTaJlzZjehiQ24MwRf6LTfFgkrBgEE AdpHDwEBB0DkKHOW2kmqfAK461+acQ49gc2Z6VoXMChRqobGP0ubb4kBiAQYFgoBOgWCX+i03wWJ BZ+mAAkQ4JLrOlyhDbpHFAAAAAAAHgAgc2FsdEBub3RhdGlvbnMuc2VxdW9pYS1wZ3Aub3Jnfvo+ nHoxDwaLaJD8XZuXiaqBNZtIGXIypF1udBBRoc0CmwICHgG+oAQZFgoAbwWCX+i03wkQPp1xc3He VlxHFAAAAAAAHgAgc2FsdEBub3RhdGlvbnMuc2VxdW9pYS1wZ3Aub3JnaheiqE7Pfi3Atb3GGTw+ jFcBGOaobgzEJrhEuFpXREEWIQQttUkcnfDcj0MoY88+nXFzcd5WXAAAvrsBAIJ5sBg8Udocv25N stN/zWOiYpnjjvOjVMLH4fV3pWE1AP9T6hzHz7hRnAA8d01vqoxOlQ3O6cb/kFYAjqx3oMXSBhYh BMKfigwB81402BaqXOCS6zpcoQ26AADX7gD/b83VObe14xrNP8xcltRrBZF5OE1rQSPkMNy+eWpk eCwA/1hxiS8ZxL5/elNjXiWuHXEvUGnRoVj745Vl48sZPVYMuDgEX+i03xIKKwYBBAGXVQEFAQEH QIGex1WZbH6xhUBve5mblScGYU+Y8QJOomXH+rr5tMsMAwEICYjJBBgWCgB7BYJf6LTfBYkFn6YA CRDgkus6XKENukcUAAAAAAAeACBzYWx0QG5vdGF0aW9ucy5zZXF1b2lhLXBncC5vcmcEAx9vTD3b J0SXkhvcRcCr6uIDJwic3KFKxkH1m4QW0QKbDAIeARYhBMKfigwB81402BaqXOCS6zpcoQ26AAAX mwD8CWmukxwskU82RZLMk5fm1wCgMB5z8dA50KLw3rgsCykBAKg1w/Y7XpBS3SlXEegIg1K1e6dR fRxL7Z37WZXoH8AH
Date: Thu, 29 Apr 2021 11:57:32 -0400
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Subject: Re: [openpgp] [RFC4880bis PATCH] Drop "Compatibility Profiles" section.
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On Wed 2021-04-28 23:58:48 -0400, Paul Wouters wrote:
>>>> Additionally, the phrase "A compliant application MUST only use
>>>> iterated and salted S2K"... is also mostly fine, but I had already
>>>> covered a proposal for that one in the previous
>>>> https://gitlab.com/openpgp-wg/rfc4880bis/-/merge_requests/42
>>>
>>> I would need to hear from more people about this change to see if
>>> there is consensus for this.
>>>
>>> speaking with no roles others than an individual:
>>
>> This part was proposed in February on a different thread. I am moving
>> your comment there and replying in that one:
>>
>> https://mailarchive.ietf.org/arch/msg/openpgp/ml5gzuQtSY6ANBejs8Xk66x_abQ
>
> I've merged in this change in a seperate commit, please review as part
> of the next draft update. (commit 464ac8232f9)


I think the commit you're talking about is now public as
1edfd5d45a49a5a15d08eff9fff7d5c482acb6da, 'update text on "Simple S2K
and Salted S2K specifiers" as per WG discussion'.

minor clarification: among a few other changes, it adds this line:

+Implementations SHOULD NOT use these methods on encryption of both keys and messages.


I think this "both" should be "either" -- otherwise, the guidance sounds
like it applies only to some combination encryption (which isn't
possible iirc).  otherwise, it looks good to me.

         --dkg