Re: [Gen-art] [avtext] Genart LC review: draft-ietf-avtext-rtp-grouping-taxonomy-06


On 5/20/15 3:25 PM, Ben Campbell wrote:
> Magnus and Robert: Is there an action implied here? I see that Magnus 
> agreed that there was an oversight in regards to security, but it's 
> not clear to me what action (if any) is planned.
I think Magnus was sketching out proposed new text for the document.
>
> Thanks!
>
> Ben.
>
> On 18 May 2015, at 4:38, Magnus Westerlund wrote:
>
>> Robert Sparks skrev den 2015-05-14 21:21:
>>
>>> Major issues:
>>>
>>> I'm surprised that there is no mention of how SRTP fits into the
>>> vocabulary this
>>> document builds. Would it be a mistake for someone to think of SRTP 
>>> as what
>>> this document calls a transformation? Are there any consequences of
>>> using SRTP
>>> on one or more of the streams being associated that impact how you 
>>> would
>>> talk about
>>> the association? (There are certainly consequences about which elements
>>> can see
>>> into the various streams).
>>>
>>
>> Yes, encryption is clearly a transformation. And there are cases 
>> where the order of the encryption and other transformations, like 
>> FEC, do matter. Thus, I agree that it is an significant oversight to 
>> not include security.
>>
>> So SRTP is an Securing / Protection (as it is not only Encryption) 
>> transformation that operates on Source RTP Streams or Redundancy RTP 
>> Streams to create Secured Source RTP Streams or Secured Redundancy 
>> RTP Stream.
>>
>> If one looks on something like ISMAcrypt that operates on a special 
>> form of packetized encoded streams, i.e. payload created, but not RTP 
>> headers, we get into further distinctions that we so far haven't 
>> needed to have.
>>
>> I don't know how well we must ensure that something like ISMAcrypt is 
>> clearly defined, because then we do need to split the RTP 
>> packetization transformation into two parts.
>>
>> Cheers
>>
>> Magnus Westerlund
>>
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