Re: [payload] Padding in draft-ietf-codec-opus-07?

[Stephen Botzko <[e-mail]>]

I think RTP padding should be sufficient.

Regards,
Stephen

Sent from my Verizon Wireless Device

Christian Hoene <[e-mail]> wrote:

>Hello,
>
>I am wondering about a padding feature in draft-ietf-codec-opus-07. It
>allows you to extend the frame size by filling it up with zeros.
>
> I just spoke with the Tim, Jean-Marc and Gregory about this feature. As far
>as I understood, this feature is required at transcoding gateways to enforce
>a stream of packets having a constant size (while using UDP). Otherwise,
>attackers could potentially follow the conversation by observing packet
>sizes. 
>
>To my understanding, padding is a feature that can be easily skipped from
>the codec specification. It violates the layering principle and is intended
>only for a very specific use cases. On the other side, constant sized frames
>can be easily supported by keeping the codec parameters fixed.
>
>With best regards,
>
> Christian Hoene
>
>
>
>----------------------------------------------------------------------------
>-----
>Dr.-Ing. Christian Hoene, University of Tübingen, Computer Science, Chair of
>Communication Networks, Research Group Interactive Communication Systems
>(ICS)
>Sand 13, 72076 Tübingen, Germany, Tel [phone],
>www.net.uni-tuebingen.de
>
>
>
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