Re: [TLS] Roman Danyliw's No Objection on draft-ietf-tls-grease-03: (with COMMENT)

Roman Danyliw <rdd@cert.org> Thu, 22 August 2019 03:18 UTC

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From: Roman Danyliw <rdd@cert.org>
To: Martin Thomson <mt@lowentropy.net>, David Benjamin <davidben=40google.com@dmarc.ietf.org>
CC: "draft-ietf-tls-grease@ietf.org" <draft-ietf-tls-grease@ietf.org>, "<tls@ietf.org>" <tls@ietf.org>, The IESG <iesg@ietf.org>, tls-chairs <tls-chairs@ietf.org>
Thread-Topic: [TLS] Roman Danyliw's No Objection on draft-ietf-tls-grease-03: (with COMMENT)
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Date: Thu, 22 Aug 2019 03:18:47 +0000
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Subject: Re: [TLS] Roman Danyliw's No Objection on draft-ietf-tls-grease-03: (with COMMENT)
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> -----Original Message-----
> From: Martin Thomson [mailto:mt@lowentropy.net]
> Sent: Wednesday, August 21, 2019 8:02 PM
> To: David Benjamin <davidben=40google.com@dmarc.ietf.org>;; Roman
> Danyliw <rdd@cert.org>;
> Cc: draft-ietf-tls-grease@ietf.org; <tls@ietf.org>; <tls@ietf.org>;; The IESG
> <iesg@ietf.org>;; tls-chairs <tls-chairs@ietf.org>;
> Subject: Re: [TLS] Roman Danyliw's No Objection on draft-ietf-tls-grease-03:
> (with COMMENT)
> 
> On Thu, Aug 22, 2019, at 07:44, David Benjamin wrote:
> >  That clause was meant to be descriptive of the other bits of the
> > document. "[Such-and-such] may not be [such-and-such]ed, so [some
> > consequence of this]". Using "must not" reads odd to me: "GREASE
> > values must not be negotiated, so they do not directly impact the
> > security of TLS connections."
> 
> Perhaps what you are looking for is "cannot": "GREASE values cannot be
> negotiated, ..."

A "cannot" would make sense to me.

Roman