Re: [TLS] Encrypting record headers: practical for TLS 1.3 after all?
Bryan A Ford <brynosaurus@gmail.com> Mon, 30 November 2015 08:56 UTC
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To: Peter Gutmann <pgut001@cs.auckland.ac.nz>, "tls@ietf.org" <tls@ietf.org>
References: <56586A2F.1070703@gmail.com> <9A043F3CF02CD34C8E74AC1594475C73F4B8DA2A@uxcn10-5.UoA.auckland.ac.nz> <565AC278.2010904@gmail.com> <9A043F3CF02CD34C8E74AC1594475C73F4B92E74@uxcn10-5.UoA.auckland.ac.nz>
From: Bryan A Ford <brynosaurus@gmail.com>
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Subject: Re: [TLS] Encrypting record headers: practical for TLS 1.3 after all?
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On 11/30/15 2:26 AM, Peter Gutmann wrote: > Bryan A Ford <brynosaurus@gmail.com> writes: > >> Feel free to attack my proposal but then please attack *my* proposal, not >> the old broken SSH approach. > > I was actually commenting on the concept of encrypting headers in general, > not the specific case you'd given. That is, I assumed you'd specifically > chosen the one case where it's practical, an AEAD stream cipher, and used > that as a strawman. Re-reading your post, it looks like "adding a stream > cipher to every TLS 1.3-compatible ciphersuite" should really be "require > that the only cipher type allowed for TLS be an AEAD stream cipher", > because it's not going to work with anything else. In my proposal I focused on AEAD because I had understood (and thought I had read in the TLS spec) that TLS had decided to move to AEAD-based encryption in general. I had no intention of implying that TLS "must" switch to AEAD completely, and there's no reason it would need to for my proposal to work. It would work just as well and in exactly the same way if the AEAD is replaced with the traditional Encrypt-then-MAC construction, for example. Also, if any issues with some (e.g., old) ciphersuites do arise, I wouldn't object to specifying that TLS header encryption is done only with "new" ciphersuites (e.g., the AEAD-based ones, or using some other appropriate definition of "new"). Bryan
- [TLS] Encrypting record headers: practical for TL… Bryan A Ford
- Re: [TLS] Encrypting record headers: practical fo… Henrick Hellström
- Re: [TLS] Encrypting record headers: practical fo… Peter Gutmann
- Re: [TLS] Encrypting record headers: practical fo… Henrick Hellström
- Re: [TLS] Encrypting record headers: practical fo… Roland Zink
- Re: [TLS] Encrypting record headers: practical fo… Henrick Hellström
- Re: [TLS] Encrypting record headers: practical fo… Henrick Hellström
- Re: [TLS] Encrypting record headers: practical fo… Roland Zink
- Re: [TLS] Encrypting record headers: practical fo… Tony Arcieri
- Re: [TLS] Encrypting record headers: practical fo… Watson Ladd
- Re: [TLS] Encrypting record headers: practical fo… Henrick Hellström
- Re: [TLS] Encrypting record headers: practical fo… Bryan A Ford
- Re: [TLS] Encrypting record headers: practical fo… Bryan A Ford
- Re: [TLS] Encrypting record headers: practical fo… Henrick Hellström
- Re: [TLS] Encrypting record headers: practical fo… Bryan A Ford
- Re: [TLS] Encrypting record headers: practical fo… Bill Cox
- Re: [TLS] Encrypting record headers: practical fo… Nikos Mavrogiannopoulos
- Re: [TLS] Encrypting record headers: practical fo… Dave Garrett
- Re: [TLS] Encrypting record headers: practical fo… Peter Gutmann
- Re: [TLS] Encrypting record headers: practical fo… Peter Gutmann
- Re: [TLS] Encrypting record headers: practical fo… Short, Todd
- Re: [TLS] Encrypting record headers: practical fo… Bryan A Ford
- Re: [TLS] Encrypting record headers: practical fo… Bryan A Ford
- Re: [TLS] Encrypting record headers: practical fo… Bryan A Ford
- Re: [TLS] Encrypting record headers: practical fo… Bryan A Ford
- Re: [TLS] Encrypting record headers: practical fo… Peter Gutmann
- Re: [TLS] Encrypting record headers: practical fo… Jacob Appelbaum
- Re: [TLS] Encrypting record headers: practical fo… Hubert Kario
- Re: [TLS] Encrypting record headers: practical fo… Jacob Appelbaum
- Re: [TLS] Encrypting record headers: practical fo… Viktor Dukhovni
- Re: [TLS] Encrypting record headers: practical fo… Jacob Appelbaum
- Re: [TLS] Encrypting record headers: practical fo… Fabrice Gautier
- Re: [TLS] Encrypting record headers: practical fo… Jim Schaad
- Re: [TLS] Encrypting record headers: practical fo… Yoav Nir
- Re: [TLS] Encrypting record headers: practical fo… Hubert Kario
- Re: [TLS] Encrypting record headers: practical fo… Aaron Zauner
- Re: [TLS] Encrypting record headers: practical fo… Yoav Nir
- Re: [TLS] Encrypting record headers: practical fo… John Mattsson
- Re: [TLS] Encrypting record headers: practical fo… Bryan A Ford
- Re: [TLS] Encrypting record headers: practical fo… Bryan A Ford
- [TLS] Fully encrypted and authenticated headers (… Bryan A Ford
- Re: [TLS] Fully encrypted and authenticated heade… Dmitry Belyavsky
- Re: [TLS] Fully encrypted and authenticated heade… Bryan A Ford
- Re: [TLS] Encrypting record headers: practical fo… Fabrice Gautier
- Re: [TLS] Encrypting record headers: practical fo… Peter Gutmann
- Re: [TLS] Fully encrypted and authenticated heade… Martin Thomson
- Re: [TLS] Fully encrypted and authenticated heade… Viktor Dukhovni
- Re: [TLS] Encrypting record headers: practical fo… Yoav Nir
- Re: [TLS] Encrypting record headers: practical fo… Yoav Nir
- Re: [TLS] Fully encrypted and authenticated heade… Dmitry Belyavsky
- Re: [TLS] Fully encrypted and authenticated heade… Bryan Ford
- Re: [TLS] Fully encrypted and authenticated heade… Bryan Ford
- Re: [TLS] Encrypting record headers: practical fo… Bryan Ford
- Re: [TLS] Encrypting record headers: practical fo… Bryan Ford
- Re: [TLS] Encrypting record headers: practical fo… GUBALLA, JENS (JENS)
- Re: [TLS] Encrypting record headers: practical fo… Jacob Appelbaum
- Re: [TLS] Encrypting record headers: practical fo… Yoav Nir
- Re: [TLS] Encrypting record headers: practical fo… Jacob Appelbaum
- Re: [TLS] Encrypting record headers: practical fo… Jacob Appelbaum
- Re: [TLS] Encrypting record headers: practical fo… Hubert Kario
- Re: [TLS] Encrypting record headers: practical fo… Yoav Nir
- Re: [TLS] Encrypting record headers: practical fo… Eric Rescorla
- Re: [TLS] Fully encrypted and authenticated heade… Eric Rescorla
- Re: [TLS] Encrypting record headers: practical fo… Mike Copley
- Re: [TLS] Fully encrypted and authenticated heade… Jacob Appelbaum
- Re: [TLS] Encrypting record headers: practical fo… Jacob Appelbaum
- Re: [TLS] Encrypting record headers: practical fo… Jacob Appelbaum
- Re: [TLS] Fully encrypted and authenticated heade… Watson Ladd
- Re: [TLS] Encrypting record headers: practical fo… Salz, Rich
- Re: [TLS] Encrypting record headers: practical fo… Martin Rex
- Re: [TLS] Encrypting record headers: practical fo… Stephen Farrell
- Re: [TLS] Fully encrypted and authenticated heade… Eric Rescorla
- Re: [TLS] Encrypting record headers: practical fo… Jacob Appelbaum
- Re: [TLS] Encrypting record headers: practical fo… Salz, Rich
- Re: [TLS] Encrypting record headers: practical fo… Eric Rescorla
- Re: [TLS] Encrypting record headers: practical fo… Jacob Appelbaum
- Re: [TLS] Encrypting record headers: practical fo… Salz, Rich
- Re: [TLS] Encrypting record headers: practical fo… Martin Rex
- Re: [TLS] Encrypting record headers: practical fo… Ilari Liusvaara
- Re: [TLS] Encrypting record headers: practical fo… Fabrice Gautier
- Re: [TLS] Encrypting record headers: practical fo… Dave Garrett
- Re: [TLS] Encrypting record headers: practical fo… Peter Gutmann
- Re: [TLS] Encrypting record headers: practical fo… Jacob Appelbaum
- Re: [TLS] Encrypting record headers: practical fo… Jacob Appelbaum
- Re: [TLS] Encrypting record headers: practical fo… Salz, Rich
- Re: [TLS] Encrypting record headers: practical fo… Eric Mill
- Re: [TLS] Encrypting record headers: practical fo… Jacob Appelbaum
- Re: [TLS] Encrypting record headers: practical fo… Jacob Appelbaum
- Re: [TLS] Encrypting record headers: practical fo… Martin Thomson
- Re: [TLS] Encrypting record headers: practical fo… Jacob Appelbaum
- Re: [TLS] Encrypting record headers: practical fo… Jacob Appelbaum
- Re: [TLS] Encrypting record headers: practical fo… Viktor Dukhovni
- Re: [TLS] Fully encrypted and authenticated heade… Bryan A Ford
- Re: [TLS] Encrypting record headers: practical fo… Bryan A Ford
- Re: [TLS] Encrypting record headers: practical fo… Bryan A Ford
- Re: [TLS] Encrypting record headers: practical fo… Bryan A Ford
- Re: [TLS] Fully encrypted and authenticated heade… Jacob Appelbaum
- Re: [TLS] Encrypting record headers: practical fo… Aaron Zauner
- Re: [TLS] Encrypting record headers: practical fo… Salz, Rich
- Re: [TLS] Encrypting record headers: practical fo… Aaron Zauner
- Re: [TLS] Encrypting record headers: practical fo… Jacob Appelbaum
- Re: [TLS] Fully encrypted and authenticated heade… Watson Ladd
- Re: [TLS] Encrypting record headers: practical fo… Jacob Appelbaum
- Re: [TLS] Fully encrypted and authenticated heade… Jacob Appelbaum
- Re: [TLS] Encrypting record headers: practical fo… Aaron Zauner
- Re: [TLS] Encrypting record headers: practical fo… Aaron Zauner
- Re: [TLS] Encrypting record headers: practical fo… Martin Rex
- Re: [TLS] Encrypting record headers: practical fo… Jacob Appelbaum
- Re: [TLS] Encrypting record headers: practical fo… Peter Gutmann
- Re: [TLS] Encrypting record headers: practical fo… Jacob Appelbaum
- Re: [TLS] Fully encrypted and authenticated heade… Valery Smyslov
- Re: [TLS] Fully encrypted and authenticated heade… Bryan Ford
- Re: [TLS] Encrypting record headers: practical fo… GUBALLA, JENS (JENS)
- Re: [TLS] Fully encrypted and authenticated heade… Valery Smyslov
- Re: [TLS] Fully encrypted and authenticated heade… Jacob Appelbaum
- Re: [TLS] Fully encrypted and authenticated heade… Jeff Burdges
- Re: [TLS] Encrypting record headers: practical fo… Peter Gutmann
- Re: [TLS] Encrypting record headers: practical fo… Jacob Appelbaum