On Jan 27, 2021, at 10:09 AM, John Mattsson 
<john.mattsson=40ericsson....@dmarc.ietf.org> wrote:
> 
> Looking at the GitHub version after the latest changes. I don't think the 
> tradeoffs make sense anymore.
> 
> - Full handshake is now 4.5 round-trips

  Does that account for large / long certificate chains?

> - Resumption is now 4.5 round-trips.
> 
> This does not seem like a good tradeoff or optimization at all. If we instead 
> skipped Resumption, the full handshake could as far as I understand always be 
> done in 3.5 round-trips. This would cut a large amount of complexity from the 
> draft and implementations and make the protocol much faster.

  That sounds good.  But how would this affect other TLS-based EAP methods?  
They send data inside of the tunnel, which adds round trips.  So perhaps 
resumption is useful there?

  It would likely be problematic if EAP-TLS doesn't support resumption, but 
TTLS / PEAP / etc. required it.

  And of course, this ignores the timeliness of the changes.  I suspect that 
silence from the WG means that consensus is "we can afford to wait another year 
for EAP-TLS to be finished".

  Alan DeKok.

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