Re: [TLS] Confirming consensus: TLS1.3->TLS*
Ilari Liusvaara <ilariliusvaara@welho.com> Sat, 19 November 2016 06:27 UTC
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Date: Sat, 19 Nov 2016 08:27:25 +0200
From: Ilari Liusvaara <ilariliusvaara@welho.com>
To: Peter Gutmann <pgut001@cs.auckland.ac.nz>
Message-ID: <20161119062725.GA30600@LK-Perkele-V2.elisa-laajakaista.fi>
References: <CF83FAD0-B337-4F9E-A80B-2BAA6826BF41@sn3rd.com> <20161118121909.GA28464@LK-Perkele-V2.elisa-laajakaista.fi> <1479474222033.25911@cs.auckland.ac.nz> <20161118154043.GA28666@LK-Perkele-V2.elisa-laajakaista.fi> <1479523253827.80996@cs.auckland.ac.nz>
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Subject: Re: [TLS] Confirming consensus: TLS1.3->TLS*
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On Sat, Nov 19, 2016 at 02:41:04AM +0000, Peter Gutmann wrote: > Replying to several messages at once to save space: > > Ilari Liusvaara: > > >One can downnegotiate TLS 1.3 to TLS 1.2. > > Ah, you're obviously a fan of Steve Wozniak humour. When someone asked him > whether it was possible to upgrade from an Apple II+ to an Apple IIe, he > similarly said "yes, you unplug the power cable from the II+, throw it away, > and plug the IIe into the newly-vacated power cable". Nope, I was referring to the very technical property that if client sends a TLS 1.3 handshake, a TLS 1.2 server can still successfully interop, provoded that the client does TLS 1.2 too (which I think every TLS client known to support TLS 1.3 except Picotls does). The last major version bump, SSLv2->SSLv3, this was NOT true. SSLv2 server would barf upon receiving SSLv3 client hello (TLS 1.0 was clearly "SSL v3.1" internally). And folks could think that kind of downnegotiation wasn't the case given major version bump. Such would cause confusion much much worse than confusing the ordering of TLS and SSL versions. -Ilari
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Joseph Birr-Pixton
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Yoav Nir
- [TLS] Confirming consensus: TLS1.3->TLS* Sean Turner
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Erik Nygren
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Nick Harper
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Tony Arcieri
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Viktor Dukhovni
- Re: [TLS] Confirming consensus: TLS1.3->TLS* David Benjamin
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Dave Garrett
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Martin Thomson
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Peter Gutmann
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Ilari Liusvaara
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Hubert Kario
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Viktor Dukhovni
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Salz, Rich
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Peter Gutmann
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Eric Mill
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Ilari Liusvaara
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Michael Ströder
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Will Serumgard
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Adam Langley
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Henrick Hellström
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Ira McDonald
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Christian Huitema
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Dave Kern
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Martin Rex
- Re: [TLS] Confirming consensus: TLS1.3->TLS* D. J. Bernstein
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Vlad Krasnov
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Deb Cooley
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Salz, Rich
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Vlad Krasnov
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Salz, Rich
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Eftychios Theodorakis
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Vlad Krasnov
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Julien ÉLIE
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Martin Thomson
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Salz, Rich
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Eric Mill
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Nick Sullivan
- Re: [TLS] Confirming consensus: TLS1.3->TLS* David Adrian
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Kazuho Oku
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Peter Gutmann
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Peter Gutmann
- Re: [TLS] Confirming consensus: TLS1.3->TLS* David Woodhouse
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Melinda Shore
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Ilari Liusvaara
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Victor Vasiliev
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Anders Rundgren
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Jeffrey Walton
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Viktor Dukhovni
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Peter Gutmann
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Peter Gutmann
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Watson Ladd
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Ira McDonald
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Judson Wilson
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Vlad Krasnov
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Steven Valdez
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Filippo Valsorda
- Re: [TLS] Confirming consensus: TLS1.3->TLS* D. J. Bernstein
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Eric Rescorla
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Eric Mill
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Bill Frantz
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Xiaoyin Liu
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Mark Nottingham
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Viktor Dukhovni
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Peter Gutmann
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Andrey Jivsov
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Andrei Popov
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Salz, Rich
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Dmitry Belyavsky
- Re: [TLS] Confirming consensus: TLS1.3->TLS* darin.pettis
- Re: [TLS] Confirming consensus: TLS1.3->TLS* =JeffH
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Salz, Rich
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Yoav Nir
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Eric Rescorla
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Short, Todd
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Sean Leonard
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Richard Barnes
- Re: [TLS] Confirming consensus: TLS1.3->TLS* David Woodhouse
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Salz, Rich
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Hugo Krawczyk
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Scott Schmit
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Daniel Migault
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Dave Garrett
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Anders Rundgren
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Dan Brown
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Timothy Jackson
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Raja ashok
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Nick Sullivan
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Peter Gutmann
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Viktor Dukhovni
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Tony Arcieri
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Watson Ladd
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Peter Gutmann
- Re: [TLS] Confirming consensus: TLS1.3->TLS* David Benjamin
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Salz, Rich
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Salz, Rich
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Bill Frantz
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Stephen Farrell
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Peter Gutmann
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Yoav Nir
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Peter Gutmann
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Matt Caswell
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Hubert Kario
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Salz, Rich
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Ted Lemon
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Salz, Rich
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Hubert Kario
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Salz, Rich
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Peter Gutmann
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Hubert Kario
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Ackermann, Michael
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Hubert Kario
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Thomas Pornin
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Ted Lemon
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Maarten Bodewes
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Daniel Kahn Gillmor
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Salz, Rich
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Rob Stradling
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Hubert Kario
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Andrei Popov
- Re: [TLS] Confirming consensus: TLS1.3->TLS* David Benjamin
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Yoav Nir
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Andrei Popov
- Re: [TLS] Confirming consensus: TLS1.3->TLS* darin.pettis
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Viktor Dukhovni
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Ackermann, Michael
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Salz, Rich
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Salz, Rich
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Aaron Zauner
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Michael D'Errico
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Patrick McManus
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Peter Gutmann
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Ted Lemon
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Peter Gutmann
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Peter Gutmann
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Tony Arcieri
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Tony Arcieri
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Viktor Dukhovni
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Scott Schmit
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Scott Schmit
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Tony Arcieri
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Karthik Bhargavan
- [TLS] closing thread -> Re: Confirming consensus:… Sean Turner
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Peter Gutmann
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Mohan Sekar
- Re: [TLS] Confirming consensus: TLS1.3->TLS* Joseph Salowey