Re: [Geopriv] HELD and persistent TLS connections in emergency calls

[Hannes Tschofenig <Hannes.Tschofenig at gmx.net>]

Hi Henning,

> At 12:54 PM 9/14/2007, Henning Schulzrinne wrote:
> > There are well-known ways to reduce the cost of TLS establishment. I
> > think this is called session resumption, but I'm not a TLS expert.
This entirely correct. TLS session resumption would certainly help in 
this case. For the performance read here:
http://pages.cs.wisc.edu/~cao/WISP98/final-versions/artg.ps
(I am sure that there are better and more recent papers but I have to 
search a bit...)

Even better, there is also http://tools.ietf.org/html/rfc4507 "Transport 
Layer Security (TLS) Session Resumption without Server-Side State" that 
provides session resumption without keeping state at the server. 
Performance data can be found here:
http://crypto.stanford.edu/~dabo/abstracts/fasttrack.html

Maybe that's something we should consider for HELD to provide a scalable 
and lightweight solution

Ciao
Hannes



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