Sure, those are fine weasel words.  But do we really want to allow into this 
protocol something that can be misused with security implications in a protocol 
that’s attempting to solve a security problem?  I really don’t know.  I’m 
inclined to say, ‘no’ though.  For all those same reasons that IPsec provides 
replay detection, I think TLS should too.

Derrell

> On May 4, 2017, at 4:00 PM, Erik Nygren <erik+i...@nygren.org> wrote:
> 
> "The onus is on clients not to send messages in 0-RTT data which are not safe 
> to have replayed and which they would not be willing to retry across multiple 
> 1-RTT connections. The onus is on servers to protect themselves against 
> attacks employing 0-RTT data replication."
> 
> The server responsibility is a general property TLS can maintain while the 
> client responsibility requires an application profile to define.  

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