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Re: [TLS] analysis of wider impact of TLS1.3 replayabe data

Colm MacCárthaigh <colm@allcosts.net> Mon, 14 March 2016 04:15 UTC

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Date: Sun, 13 Mar 2016 21:15:37 -0700
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From: Colm MacCárthaigh <colm@allcosts.net>
To: Eric Rescorla <ekr@rtfm.com>
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Subject: Re: [TLS] analysis of wider impact of TLS1.3 replayabe data
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Ar Dé Domhnaigh 13 Márta 2016, scríobh Eric Rescorla <ekr@rtfm.com>:
>
>
> 1. Nothing requires applications to use this feature at all. First, servers
> need to advertise it and are free to (a) not offer clients the ability to
> send
> 0-RTT data and (b) refuse to accept it if clients send it. Moreover,
> everyone
> I know of who is considering building a 1.3 library intends to provide
> that data to the server via a separate API, so the server will have to work
> to get it.
>

security is very difficult to judge and measure - but speed is very easy.
This sets up a sort of "race to the bottom" where providers may feel
pressured to respond and enable an unsafe feature; because the speed
benefit is more apparent than the loss of security.  There's a real trade
off; we should favor the s in tls :)

-
Colm


-- 
Colm

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