Re: [TLS] WGLC for "Deprecating TLSv1.0 and TLSv1.1"

Peter Gutmann <pgut001@cs.auckland.ac.nz> Tue, 07 May 2019 10:34 UTC

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From: Peter Gutmann <pgut001@cs.auckland.ac.nz>
To: David Benjamin <davidben@chromium.org>, "<tls@ietf.org>" <tls@ietf.org>
Thread-Topic: [TLS] WGLC for "Deprecating TLSv1.0 and TLSv1.1"
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Date: Tue, 7 May 2019 10:34:46 +0000
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References: <28511b10-8f6a-4394-95a9-5188130f7b58@www.fastmail.com> <20190503172022.GH4464@akamai.com> <1556904629782.23087@cs.auckland.ac.nz> <16747558.couhpb2nsq@pintsize.usersys.redhat.com> <785E42E7-83FB-411F-8726-989CC8B734BC@ll.mit.edu> <CAHbuEH65=xJJr4dK=UJBMgaWFZ8h8jwtLt+Nb-jGHYB_RsjcHQ@mail.gmail.com> <20190506184141.GL67454@straasha.imrryr.org>, <CAF8qwaCVcPQk6nhUUDO_Do+fQaS5Cg1gPFCFGpv8HcnTCoyzsw@mail.gmail.com>
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Subject: Re: [TLS] WGLC for "Deprecating TLSv1.0 and TLSv1.1"
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David Benjamin <davidben@chromium.org> writes:

>It meant bugs like OpenSSL's get papered over with SHA-1

That affects a whole lot more than just OpenSSL, a bit like ECDSA means P256
so hash means SHA-1.  Try switching to SHA-2 (in non-TLS usage) and you'll
find all the implementations that simply default to SHA-1, or, worse, skip any
algorithm indication that may be present and just assume the other side will
do SHA-1. Which so far has worked well enough that no-one's noticed that other
options don't.

Peter.