[AVT] Re: Key management in SRTP

[Mark Baugher <mbaugher@cisco.com>]

hi

At 03:29 PM 10/8/2002 +0200, BUYCK Jacky FTRD/DMI/CAE wrote:

> Hi
> all. 
> I'm looking on the way to secure RTP
> / RTCP sessions and I've found the SRTP Draft. 
> I've read it but I still have a
> problem with one point that don't seem to be clear for me. 
>
> I've understand how session's keys
> are generate and how all the mechanisms of encryption and signature are
> performs but I don't understand HOW initial masters keys are exchange
> ?
>
> Nowhere in the SRTP draft is specify
> key exchange protocols or something like this. Or I've  not see an
> important part in the draft.
>
> Does it rely on external protocol
> like SIP / SAP / SDP ? 
> Or is there a key exchange mechanism
> in the SRTP protocol ? 

As Elisabetta stated, there is no single key management protocol for
SRTP.  We expect that a number of them will be needed owing to the
diversity of SRTP applications.  So the data security protocol is
uncoupled from the key management protocol, like IPsec but unlike
SSL.

Mark


> Really
> thanks to u. 
>
> Jacky BUYCK 
> France Telecom R&D - Caen -
> DMI/SIR/SSI 
> 42 Rue des Coutures - BP 6243 -
> 14066 Caen Cedex 4 
> Telephone : 02.31.75.93.61
> Fax : 02.31.75.06.31