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Re: [TLS] Security review of TLS1.3 0-RTT

Viktor Dukhovni <ietf-dane@dukhovni.org> Wed, 03 May 2017 20:22 UTC

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From: Viktor Dukhovni <ietf-dane@dukhovni.org>
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Date: Wed, 03 May 2017 16:20:11 -0400
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Subject: Re: [TLS] Security review of TLS1.3 0-RTT
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> On May 3, 2017, at 3:19 PM, Colm MacCárthaigh <colm@allcosts.net> wrote:
> 
> Type 2.2 - Same as 2.1, but required to be smaller than RPSK in size, to prevent self-encryption. 

The kind of application whose security requirements preclude use of RFC 5077
session tickets can and should likely also avoid both 0-RTT and session
resumption entirely.  Otherwise, allow the server to choose a sensible session
management approach.

Second-guessing the server's design by looking at ticket sizes seems rather
contrived.

-- 
	Viktor.

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