Re: [TLS] draft-green-tls-static-dh-in-tls13-01

"Dobbins, Roland" <rdobbins@arbor.net> Wed, 19 July 2017 16:52 UTC

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From: "Dobbins, Roland" <rdobbins@arbor.net>
To: =?utf-8?B?Q29sbSBNYWNDw6FydGhhaWdo?= <colm@allcosts.net>
CC: "Blumenthal, Uri - 0553 - MITLL" <uri@ll.mit.edu>, "tls@ietf.org" <tls@ietf.org>
Thread-Topic: [TLS] draft-green-tls-static-dh-in-tls13-01
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Date: Wed, 19 Jul 2017 16:52:34 +0000
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Subject: Re: [TLS] draft-green-tls-static-dh-in-tls13-01
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> On Jul 19, 2017, at 18:35, Colm MacCárthaigh <colm@allcosts.net>; wrote:
> 
> That's not what I've seen. Instead, I see administrators creating port mirrors on demand and then filtering the traffic they are interested in using standard tcpdump rules, and I see MITM boxes that selectively decrypt some traffic to look inside it and apply some kind of security filtering. In the former case, DNS lookups and IP/port destinations are commonly used to trigger some suspicions too. 

Correct.

> That's not how the tcpdump/wireshark approach usually works. You give it the private key and decrypts the TLS connection as it's happening.

Correct. 

Ex-post-facto is insufficient to purpose.  Real-time is the focus.  Archiving is rarely done, and is typically just snippets representative of the incident in question. 

-----------------------------------
Roland Dobbins <rdobbins@arbor.net>;