[AVT] TLS-SRTP internet draft as a WG item in AVT

Hi Colin, Roni, and Tom,

I would like to ask that draft-mcgrew-tls-srtp be taken up as a  
working group action item in AVT, as part the plan for carrying  
forward the RTPSEC work (as per Cullen's email of May 11 to the  
rtpsec list).   I would like to continue on as an author of this  
work, and Eric as agreed to do the same.  There are a small number of  
minor open issues which I expect can be wrapped up quickly:

1.  The draft needs to be clarified so that, in the Symmetric RTP  
case, only one handshake is needed.

2.  Section 3.6.2.1 needs to be resolved to either decide on a  
"symmetry breaking" rule or not.  It may be desirable to have such a  
rule to handle cases in which the signaling system can't tell a  
device which should act as client and which should act as server.    
This would allow opportunistic probing, i.e. a TLS-SRTP  
implementation could attempt to find out whether another RTP  
implementation supports TLS-SRTP, absent any help from signaling.

3.  The "single DTLS session per SRTP session" issue needs to be  
decided, and Appendix A should then be removed from the draft.

4.  It should be decided to use, or not to use the "TLS Extractor",  
and Section 3.3 should be rewritten accordingly.

5.  The duplicate list of srtp profiles needs to be eliminated.

Best regards,

David

--

p.s. - here's the AVT-specific part of Cullen note, so that you don't  
need to dig it out of your mailbox: "AVT - Describe how DTLS is used  
to key SRTP and how SRTP is used in combination with DTLS. This  
includes the issues of multiplexing DTLS and SRTP on one port. draft- 
mcgrew-tls-srtp will be the starting draft for this."

_______________________________________________
Audio/Video Transport Working Group
avt@ietf.org
https://www1.ietf.org/mailman/listinfo/avt