Re: [TLS] draft-green-tls-static-dh-in-tls13-01
Jacob Hoffman-Andrews <jsha@eff.org> Sat, 08 July 2017 22:08 UTC
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From: Jacob Hoffman-Andrews <jsha@eff.org>
To: Matthew Green <matthewdgreen@gmail.com>, tls@ietf.org
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Subject: Re: [TLS] draft-green-tls-static-dh-in-tls13-01
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With all respect to the authors for a well-written paper, this draft should not be adopted by TLS WG, because it would weaken the security of TLS as deployed in practice. If the TLS WG were to adopt this draft, one of the likely outcomes would be implementation in a variety of popular TLS libraries, like OpenSSL and SChannel. Unfortunately, including interception capability in off-the-shelf software is like keeping your plutonium next to your potato chips; something is bound to go wrong. For instance, performance advocates may suggest turning on the interception capability in order to save cycles. If such advice is broadly adopted, we will effectively have reintroduced non-forward secret sessions to TLS. In TLS 1.3 there are no NULL cipher suites. Why should there be a commonly implemented mode that breaks forward secrecy? The "Weaknesses of Alternative Solutions" section nicely sums up the tradeoffs of various techniques. Under "Export of ephemeral keys," it says: > The complexity of the solution is a problem that adds risk. This is absolutely true, but doesn't mention the bearer. The enterprise that requires the interception bears the risk (or, more likely, the vendors who sell interception software). I think when balancing the monetary risk to the enterprise against the privacy risk to billions of consumer Internet users, the consumers should win. I would also point out that retrospectively decrypting pcaps asks TLS to do double duty: as at-rest encryption in addition to transit encryption. If, instead, each TLS server shares a copy of its plaintext via a TLS connection to an encrypted storage service, the enterprise gets much better security properties. Not only does it retain forward secrecy for in-datacenter traffic, it can control the keys for at-rest data much more tightly. Instead of every TLS frontend having the keys for retrospective decryption, those keys can be limited to auditors or security team members.
- [TLS] draft-green-tls-static-dh-in-tls13-01 Matthew Green
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Stephen Farrell
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Richard Barnes
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Ackermann, Michael
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Watson Ladd
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Russ Housley
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Richard Barnes
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Salz, Rich
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Andrei Popov
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Russ Housley
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Stephen Farrell
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Stephen Farrell
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Kyle Rose
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Stephen Farrell
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Russ Housley
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Stephen Farrell
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Russ Housley
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Eric Mill
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Stephen Farrell
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Russ Housley
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Stephen Farrell
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Stephen Farrell
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Russ Housley
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Stephen Farrell
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Christian Huitema
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Watson Ladd
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Ackermann, Michael
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Timothy Jackson
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Stephen Farrell
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Yoav Nir
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Ackermann, Michael
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Ackermann, Michael
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Tony Arcieri
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Ackermann, Michael
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Watson Ladd
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Jeremy Harris
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Stephen Farrell
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Russ Housley
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Stephen Farrell
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Richard Barnes
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Watson Ladd
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Stephen Farrell
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Nico Williams
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Nick Sullivan
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Jacob Hoffman-Andrews
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Dave Garrett
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Shumon Huque
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Dave Garrett
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Salz, Rich
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Roland Zink
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Colm MacCárthaigh
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Eric Mill
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Stephen Checkoway
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Nico Williams
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Salz, Rich
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Joseph Lorenzo Hall
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Yoav Nir
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Blumenthal, Uri - 0553 - MITLL
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Melinda Shore
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Roland Dobbins
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Ted Lemon
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Kathleen Moriarty
- [TLS] Fwd: draft-green-tls-static-dh-in-tls13-01 Watson Ladd
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Salz, Rich
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Jeffrey Walton
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Daniel Kahn Gillmor
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Daniel Kahn Gillmor
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Dobbins, Roland
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Dobbins, Roland
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Ted Lemon
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Dobbins, Roland
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Dobbins, Roland
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Ted Lemon
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Yoav Nir
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Dobbins, Roland
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Ted Lemon
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Ilari Liusvaara
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Dobbins, Roland
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Dobbins, Roland
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Ted Lemon
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Ted Lemon
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Dobbins, Roland
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Nick Sullivan
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Daniel Kahn Gillmor
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Daniel Kahn Gillmor
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Roland Dobbins
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Roland Dobbins
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Kyle Rose
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Kyle Rose
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Kyle Rose
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Ackermann, Michael
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Ackermann, Michael
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Kathleen Moriarty
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Ted Lemon
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Kathleen Moriarty
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Ackermann, Michael
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Colm MacCárthaigh
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Dobbins, Roland
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Dobbins, Roland
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Ackermann, Michael
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Salz, Rich
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Watson Ladd
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Watson Ladd
- Re: [TLS] Fwd: draft-green-tls-static-dh-in-tls13… Roland Zink
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Ackermann, Michael
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Roland Zink
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Roland Zink
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Salz, Rich
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Roland Zink
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Ilari Liusvaara
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Salz, Rich
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Roland Zink
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Salz, Rich
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Roland Zink
- Re: [TLS] Fwd: draft-green-tls-static-dh-in-tls13… Watson Ladd
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Colm MacCárthaigh
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Daniel Kahn Gillmor
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Watson Ladd
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Stephen Farrell
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Peter Gutmann
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Colm MacCárthaigh
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Ilari Liusvaara
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Salz, Rich
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Melinda Shore
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Stephen Farrell
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Stephen Farrell
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Colm MacCárthaigh
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Salz, Rich
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Colm MacCárthaigh
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Ted Lemon
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Salz, Rich
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Colm MacCárthaigh
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Salz, Rich
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Kathleen Moriarty
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Wartan Hachaturow
- Re: [TLS] Fwd: draft-green-tls-static-dh-in-tls13… Roland Zink
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Ackermann, Michael
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Ackermann, Michael
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Mark Nottingham
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Daniel Kahn Gillmor
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Melinda Shore
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Roland Dobbins
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Roland Dobbins
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Roland Dobbins
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Roland Dobbins
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Roland Dobbins
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Salz, Rich
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Salz, Rich
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Tom Ritter
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Dobbins, Roland
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Dobbins, Roland
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Salz, Rich
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Dobbins, Roland
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Dobbins, Roland
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Blumenthal, Uri - 0553 - MITLL
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Yoav Nir
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Roland Dobbins
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Yoav Nir
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Roland Dobbins
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Roland Dobbins
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Roland Dobbins
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Salz, Rich
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Yoav Nir
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Roland Dobbins
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Benjamin Kaduk
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Benjamin Kaduk
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Roland Dobbins
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Blumenthal, Uri - 0553 - MITLL
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Dobbins, Roland
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Blumenthal, Uri - 0553 - MITLL
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Watson Ladd
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Roland Dobbins
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Watson Ladd
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Colm MacCárthaigh
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Blumenthal, Uri - 0553 - MITLL
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Colm MacCárthaigh
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Dobbins, Roland
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Blumenthal, Uri - 0553 - MITLL
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Dobbins, Roland
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Watson Ladd
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Dobbins, Roland
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Dobbins, Roland
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Blumenthal, Uri - 0553 - MITLL
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Dobbins, Roland
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Dobbins, Roland
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Watson Ladd
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Blumenthal, Uri - 0553 - MITLL
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Roland Dobbins
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Roland Dobbins
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Ted Lemon
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Watson Ladd
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Simon Friedberger
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Carl Mehner
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Roland Dobbins
- Re: [TLS] draft-green-tls-static-dh-in-tls13-01 Simon Friedberger