Re: [AVT] SRTP with layered encoding

["Jonathan Lennox" <jonathan at vidyo.com>]

I think that using different master keys for different RTP sessions is
fairly essential for SRTP, to prevent two-time pad failures; I'd be
pretty concerned about breaking this.  Why do you want to?

-- 
Jonathan Lennox
Vidyo, Inc
jonathan at vidyo.com

> -----Original Message-----
> From: Marc Petit-Huguenin [mailto:petithug at acm.org]
> Sent: Monday, October 19, 2009 7:05 PM
> To: avt at ietf.org
> Subject: [AVT] SRTP with layered encoding
> 
> I was not able to find guidelines on how to use SRTP with multicast
> layered
> encoding.  As all the layers share the same SSRC, the same master key
> cannot be
> shared between them.
> 
> Using the same master key for all the layers would be great though, so
> I was
> thinking that a way to do this would be to redefine the label byte so
> the 5
> first bits are used for the layer number (from 0 to 31).
> 
> Any thoughts on this?  Should I write an I-D?
> 
> Thanks.
> 
> --
> Marc Petit-Huguenin
> Personal email: marc at petit-huguenin.org
> Professional email: petithug at acm.org
> Blog: http://blog.marc.petit-huguenin.org
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