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Re: [TLS] three ECHO issues

Christian Huitema <huitema@huitema.net> Mon, 09 March 2020 02:13 UTC

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To: Stephen Farrell <stephen.farrell@cs.tcd.ie>, Christopher Wood <caw@heapingbits.net>
Cc: tls@ietf.org
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From: Christian Huitema <huitema@huitema.net>
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Date: Sun, 08 Mar 2020 19:13:05 -0700
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Subject: Re: [TLS] three ECHO issues
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On 3/8/2020 10:14 AM, Stephen Farrell wrote:

> I'm questioning whether that's a good goal or not. In my
> analysis of the various extensions, only SNI and ALPN seem
> to offer immediate value.

Uh, No. First, we do have fingerprinting attacks that look at the
pattern of extensions. If the extensions are encrypted in the ESNI, they
cannot do that. And then, we have extensions that reveal a lot about the
app, like for example the QUIC parameters extension. Those are just as
sensitive as the ALPN.

-- Christian Huitema

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