On Friday, February 19, 2016 12:57:04 am Bill Cox wrote:
> Having two different modes to achieve basically the same
> thing in TLS 1.3 is a bad idea.

On Friday, February 19, 2016 10:01:31 am Salz, Rich wrote:
> I greatly prefer one way to do things.

I do not fundamentally disagree. I would support dropping PSK resumption in 
favor of using only DHE 0RTT for resumption.

With PSK resumption, as far as I know, the issue of what cipher suites to offer 
& use has not been settled, or at least written down in the spec. Not having to 
use all of the PSK suites (or non-PSK suites but actually using PSK, which 
could be confusing) and the PSK extension for resumption, and instead using 
some session ID and DHE 0RTT would be simpler and not loose capability.

I think that requiring PSK for 0RTT would significantly reduce the availability 
of actually using 0RTT, whilst providing no way to improve the situation over 
the long term. It would mean that TLS only has 0RTT resumption and not actually 
have any 0RTT sessions.


Dave

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