Re: [TLS] analysis of wider impact of TLS1.3 replayabe data
Bill Cox <waywardgeek@google.com> Sun, 13 March 2016 19:04 UTC
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Date: Sun, 13 Mar 2016 12:04:43 -0700
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From: Bill Cox <waywardgeek@google.com>
To: Ilari Liusvaara <ilariliusvaara@welho.com>
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Subject: Re: [TLS] analysis of wider impact of TLS1.3 replayabe data
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On Sun, Mar 13, 2016 at 11:23 AM, Ilari Liusvaara <ilariliusvaara@welho.com> wrote: > TLS 1.3 1-RTT is just boring, unless you are trying to do something > at least a bit screwy, like mix pure-PSK and client-auth. > > No such luck with 0-RTT. There is all sorts of cryptographic screwyness > in there too (through getting rid of DH-0RTT should eliminate that). > This is just my personal opinion: I second your opinion that as Ekr suggested, TLS 1.3 should drop DH-0RTT. Only 0-RTT resume should be supported. That way, we start off with the same security as 1-RTT, simplifying analysis and reducing vulnerabilities. IMO, 0-RTT is the most important new feature in TLS 1.3, though the current spec giving us two different ways to shoot ourselves in the foot with 0-RTT seems redundant. While this is in no way related to my job within Google, I do not see how a company like Google could justify switching from QUIC crypto to TLS 1.3 without a 0-RTT capability. Note that the job I actually do at Google, working on Token Binding, is significantly threatened by 0-RTT (just like client-certs), so I have plenty of reason to be against 0-RTT. I just feel the world needs 0-RTT. Speed really _is_ that important. Finally, I feel that while the TLS 1.3 spec does a good job of trying to scare away people from 0-RTT, it would be better if we also explained what is required to use 0-RTT in a secure mode. Perhaps this does not belong in the spec, but at least a link to read about it should be, IMO. It _can_ be done, if the client and server are willing to pay the high cost required. Bill
- [TLS] analysis of wider impact of TLS1.3 replayab… Stephen Farrell
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Eric Rescorla
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Stephen Farrell
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Eric Rescorla
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Stephen Farrell
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Salz, Rich
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Eric Rescorla
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Yoav Nir
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Salz, Rich
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Stephen Farrell
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Kurt Roeckx
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Eric Rescorla
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Salz, Rich
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Ilari Liusvaara
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Andrei Popov
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Bill Cox
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Scott Schmit
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Bill Cox
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Erik Nygren
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Harlan Lieberman-Berg
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Colm MacCárthaigh
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Colm MacCárthaigh
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Bill Cox
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Ilari Liusvaara
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Eric Rescorla
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Eric Rescorla
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Nikos Mavrogiannopoulos
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Kyle Nekritz
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Bill Cox
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Colm MacCárthaigh
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Colm MacCárthaigh
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Colm MacCárthaigh
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Viktor Dukhovni
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Subodh Iyengar
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Watson Ladd
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Subodh Iyengar
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Colm MacCárthaigh
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Bill Cox
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Colm MacCárthaigh
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Ilari Liusvaara
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Colm MacCárthaigh
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Geoffrey Keating
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Bill Cox
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Ryan Hamilton
- [TLS] Splitting all stateless 0RTT into its own d… Dave Garrett
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Salz, Rich
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Bill Cox
- Re: [TLS] Splitting all stateless 0RTT into its o… Eric Rescorla
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Geoffrey Keating
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Ryan Hamilton
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Ryan Hamilton
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Colm MacCárthaigh
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Kyle Nekritz
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Bill Cox
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Eric Rescorla
- Re: [TLS] Splitting all stateless 0RTT into its o… Ilari Liusvaara
- Re: [TLS] Splitting all stateless 0RTT into its o… Viktor Dukhovni
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Hubert Kario
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Martin Thomson
- Re: [TLS] analysis of wider impact of TLS1.3 repl… Hubert Kario