Re: [TLS] Security review of TLS1.3 0-RTT
Nico Williams <nico@cryptonector.com> Wed, 03 May 2017 04:30 UTC
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Date: Tue, 02 May 2017 23:28:05 -0500
From: Nico Williams <nico@cryptonector.com>
To: TLS WG <tls@ietf.org>
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Subject: Re: [TLS] Security review of TLS1.3 0-RTT
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On Tue, May 02, 2017 at 11:27:04PM -0400, Viktor Dukhovni wrote: > > On May 2, 2017, at 9:45 PM, Colm MacCárthaigh <colm@allcosts.net> wrote: > > I think we have to assume that a replay attempt could come at any time. > > A time based mitigation doesn't work. > > A time-based mitigation does not remove the need for an anti-replay > cache (where a service protocol, supports 0-RTT, but is not idempotent). Bingo. There's no need for a replay cache for the 0 payload if it represents an idempotent operation. As long as the server can fall back on a full handshake, all is good. > What I am saying, is that a time-based counter-measure can substantially > reduce the size of the required cache, because out-of-window replays > are rejected. That replay window can be a narrow window around the time > the ticket is first (and never again legitimately) used, rather than the > much larger ticket validity interval. I don't believe replay cache size is that big a deal (though it's not nothing). The hard thing is concurrency. > I agree with Nico that additive obfuscation feels like a hack, but am > willing to accept this as somewhat "natural" within the design tradition > of TLS. That is... a ringing endorsement of he obfuscation thing! :) Nico --
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Viktor Dukhovni
- Re: [TLS] Security review of TLS1.3 0-RTT Nico Williams
- Re: [TLS] Security review of TLS1.3 0-RTT Nico Williams
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Nico Williams
- Re: [TLS] Security review of TLS1.3 0-RTT Viktor Dukhovni
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Nico Williams
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Nico Williams
- Re: [TLS] Security review of TLS1.3 0-RTT Viktor Dukhovni
- Re: [TLS] Security review of TLS1.3 0-RTT Benjamin Kaduk
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Ilari Liusvaara
- Re: [TLS] Security review of TLS1.3 0-RTT Viktor Dukhovni
- Re: [TLS] Security review of TLS1.3 0-RTT Benjamin Kaduk
- Re: [TLS] Security review of TLS1.3 0-RTT Nico Williams
- Re: [TLS] Security review of TLS1.3 0-RTT Benjamin Kaduk
- Re: [TLS] Security review of TLS1.3 0-RTT Nico Williams
- Re: [TLS] Security review of TLS1.3 0-RTT Benjamin Kaduk
- Re: [TLS] Security review of TLS1.3 0-RTT Nico Williams
- Re: [TLS] Security review of TLS1.3 0-RTT Daniel Kahn Gillmor
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Nico Williams
- Re: [TLS] Security review of TLS1.3 0-RTT Eric Rescorla
- Re: [TLS] Security review of TLS1.3 0-RTT Nico Williams
- Re: [TLS] Security review of TLS1.3 0-RTT Eric Rescorla
- Re: [TLS] Security review of TLS1.3 0-RTT Peter Gutmann
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Viktor Dukhovni
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Jeffrey Walton
- Re: [TLS] Security review of TLS1.3 0-RTT Eric Rescorla
- Re: [TLS] Security review of TLS1.3 0-RTT Viktor Dukhovni
- Re: [TLS] Security review of TLS1.3 0-RTT Nico Williams
- Re: [TLS] Security review of TLS1.3 0-RTT Nico Williams
- Re: [TLS] Security review of TLS1.3 0-RTT Nico Williams
- Re: [TLS] Security review of TLS1.3 0-RTT Nico Williams
- Re: [TLS] Security review of TLS1.3 0-RTT Eric Rescorla
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Martin Thomson
- Re: [TLS] Security review of TLS1.3 0-RTT Hannes Tschofenig
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Viktor Dukhovni
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Salz, Rich
- Re: [TLS] Security review of TLS1.3 0-RTT Viktor Dukhovni
- Re: [TLS] Security review of TLS1.3 0-RTT Salz, Rich
- Re: [TLS] Security review of TLS1.3 0-RTT Viktor Dukhovni
- Re: [TLS] Security review of TLS1.3 0-RTT Salz, Rich
- Re: [TLS] Security review of TLS1.3 0-RTT Nico Williams
- Re: [TLS] Security review of TLS1.3 0-RTT Viktor Dukhovni
- Re: [TLS] Security review of TLS1.3 0-RTT Nico Williams
- Re: [TLS] Security review of TLS1.3 0-RTT Timothy Jackson
- Re: [TLS] Security review of TLS1.3 0-RTT Viktor Dukhovni
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Nico Williams
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Viktor Dukhovni
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Nico Williams
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Viktor Dukhovni
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Martin Thomson
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Viktor Dukhovni
- Re: [TLS] Security review of TLS1.3 0-RTT Bill Cox
- Re: [TLS] Security review of TLS1.3 0-RTT Martin Thomson
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Viktor Dukhovni
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Watson Ladd
- Re: [TLS] Security review of TLS1.3 0-RTT Martin Thomson
- Re: [TLS] Security review of TLS1.3 0-RTT Viktor Dukhovni
- Re: [TLS] Security review of TLS1.3 0-RTT Salz, Rich
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Viktor Dukhovni
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Blumenthal, Uri - 0553 - MITLL
- Re: [TLS] Security review of TLS1.3 0-RTT Eric Rescorla
- Re: [TLS] Security review of TLS1.3 0-RTT Peter Gutmann
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Eric Rescorla
- Re: [TLS] Security review of TLS1.3 0-RTT Ilari Liusvaara
- Re: [TLS] Security review of TLS1.3 0-RTT Andrei Popov
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Andrei Popov
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Andrei Popov
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Andrei Popov
- Re: [TLS] Security review of TLS1.3 0-RTT Erik Nygren
- Re: [TLS] Security review of TLS1.3 0-RTT Nico Williams
- Re: [TLS] Security review of TLS1.3 0-RTT Benjamin Kaduk
- Re: [TLS] Security review of TLS1.3 0-RTT Nico Williams
- Re: [TLS] Security review of TLS1.3 0-RTT Ilari Liusvaara
- Re: [TLS] Security review of TLS1.3 0-RTT Nico Williams
- Re: [TLS] Security review of TLS1.3 0-RTT Nico Williams
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Nico Williams
- Re: [TLS] Security review of TLS1.3 0-RTT Eric Rescorla
- Re: [TLS] Security review of TLS1.3 0-RTT Kyle Nekritz
- Re: [TLS] Security review of TLS1.3 0-RTT Eric Rescorla
- Re: [TLS] Security review of TLS1.3 0-RTT Nico Williams
- Re: [TLS] Security review of TLS1.3 0-RTT Erik Nygren
- Re: [TLS] Security review of TLS1.3 0-RTT Eric Rescorla
- Re: [TLS] Security review of TLS1.3 0-RTT Kyle Nekritz
- Re: [TLS] Security review of TLS1.3 0-RTT Derrell Piper
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Benjamin Kaduk
- Re: [TLS] Security review of TLS1.3 0-RTT Eric Rescorla
- Re: [TLS] Security review of TLS1.3 0-RTT Ilari Liusvaara
- Re: [TLS] Security review of TLS1.3 0-RTT Nico Williams
- Re: [TLS] Security review of TLS1.3 0-RTT Christian Huitema
- Re: [TLS] Security review of TLS1.3 0-RTT Eric Rescorla
- Re: [TLS] Security review of TLS1.3 0-RTT Viktor Dukhovni
- Re: [TLS] Security review of TLS1.3 0-RTT Eric Rescorla
- Re: [TLS] Security review of TLS1.3 0-RTT Ilari Liusvaara
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Ilari Liusvaara
- Re: [TLS] Security review of TLS1.3 0-RTT Eric Rescorla
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT David Benjamin
- Re: [TLS] Security review of TLS1.3 0-RTT Viktor Dukhovni
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Eric Rescorla
- Re: [TLS] Security review of TLS1.3 0-RTT Ilari Liusvaara
- Re: [TLS] Security review of TLS1.3 0-RTT Ilari Liusvaara
- Re: [TLS] Security review of TLS1.3 0-RTT Eric Rescorla
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Christian Huitema
- Re: [TLS] Security review of TLS1.3 0-RTT Kyle Nekritz
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Christian Huitema
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Benjamin Kaduk
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Christian Huitema
- Re: [TLS] Security review of TLS1.3 0-RTT Viktor Dukhovni
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Viktor Dukhovni
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Benjamin Kaduk
- Re: [TLS] Security review of TLS1.3 0-RTT Salz, Rich
- Re: [TLS] Security review of TLS1.3 0-RTT Salz, Rich
- Re: [TLS] Security review of TLS1.3 0-RTT Benjamin Kaduk
- Re: [TLS] Security review of TLS1.3 0-RTT Benjamin Kaduk
- Re: [TLS] Security review of TLS1.3 0-RTT Ilari Liusvaara
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Benjamin Kaduk
- Re: [TLS] Security review of TLS1.3 0-RTT Victor Vasiliev
- Re: [TLS] Security review of TLS1.3 0-RTT Dave Garrett
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Ilari Liusvaara
- Re: [TLS] Security review of TLS1.3 0-RTT Victor Vasiliev
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Bill Cox
- Re: [TLS] Security review of TLS1.3 0-RTT Ilari Liusvaara
- Re: [TLS] Security review of TLS1.3 0-RTT Victor Vasiliev
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Eric Rescorla
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Ilari Liusvaara
- Re: [TLS] Security review of TLS1.3 0-RTT Eric Rescorla
- Re: [TLS] Security review of TLS1.3 0-RTT Eric Rescorla
- Re: [TLS] Security review of TLS1.3 0-RTT Victor Vasiliev
- Re: [TLS] Security review of TLS1.3 0-RTT Victor Vasiliev
- Re: [TLS] Security review of TLS1.3 0-RTT Ilari Liusvaara
- Re: [TLS] Security review of TLS1.3 0-RTT Bill Cox
- Re: [TLS] Security review of TLS1.3 0-RTT Colm MacCárthaigh
- Re: [TLS] Security review of TLS1.3 0-RTT Benjamin Kaduk
- Re: [TLS] Security review of TLS1.3 0-RTT Benjamin Kaduk
- Re: [TLS] Security review of TLS1.3 0-RTT Benjamin Kaduk
- Re: [TLS] Security review of TLS1.3 0-RTT Bill Cox
- Re: [TLS] Security review of TLS1.3 0-RTT Yoav Nir