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Re: [openpgp] AEAD Decryption

Daniel Kahn Gillmor <dkg@fifthhorseman.net> Thu, 21 July 2022 00:58 UTC

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From: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
To: openpgp@ietf.org
In-Reply-To: <ef25e966-503-4d9e-bf1c-b941b52945@nohats.ca>
References: <1268B7E7-9548-4AD0-8649-0E99229F2C13@rub.de> <8i4HnURYuCpNfK-SEmGL5M3tCGVBYNPwxeipH2B1zSv6SsiOkAMcMeKoQYe8FkezXy3wurKUOqBGlT-3ya8Vn9kQU3tfsJ4WXs7fK99cAmc=@protonmail.com> <9f640fe7-e35b-3478-ce9e-9e81f1d58f18@cs.tcd.ie> <ef25e966-503-4d9e-bf1c-b941b52945@nohats.ca>
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: Wed, 20 Jul 2022 20:52:13 -0400
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Subject: Re: [openpgp] AEAD Decryption
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On Tue 2022-07-19 11:03:16 -0400, Paul Wouters wrote:
> On Tue, 19 Jul 2022, Stephen Farrell wrote:
>
> [ speakinger as an individual ]
>
>> This is one of the WGLC issues [1] I'd hope we
>> can resolve without too much trouble now or at
>> IETF114.
>>
>> There's not been much discussion though, but
>> does anyone (dis)agree with Daniel's suggestion
>> below? I guess that corresponds to this merge
>> request. [2]
>
> I agree with Daniel and Marcus.

With no hats on, I am also on board with this change.  ensuring that
AEAD-protected data is only released when verified is reasonable.

For legacy data (non-AEAD) we can see why some implementations might be
willing to risk releasing malleable cleartext, but there's no
justification for doing so for AEAD-protected data.

              --dkg

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