Re: [MMUSIC] RE: I-D ACTION:draft-kaplan-mmusic-best-effort-srtp-01.txt

["Robert R. Gilman" <[e-mail]>]

Would the payload type entries be comma-separated lists for multiple-payload
channels?  We would also want to distinguish between different cryptosuites
(even if they used the same master key/salt), perhaps via multiple ordered
"crypto" entries?
-Bob
----------------------------------------------------
Bob Gilman       [e-mail]      [phone]

Dan Wing wrote:
> And another for srtp-dtls and another for zrtp?
> 
> Maybe there is a more efficient way to combine these.  Perhaps only
> including a=srtp for those key exchange mechanisms which can allow
> decrypting SRTP media that arrives prior to the SDP answer?  Or perhaps
> specifying the payload types in such a way that they're assigned to each of
> the a= key management mechanisms understood by the answerer.  As a possible
> strawman for this last idea:
> 
>   m=blahblah
>   a=key-mgmt blahblah
>   a=crypto blahblah
>   a=fingerprint blahblah (used by srtp-dtls)
>   a=zrtp
>   a=srtp key-mgmt 40 crypto 41 fingerprint 42 zrtp 43
>   
> -d
>  
> 
> 
>>-----Original Message-----
>>From: Elwell, John [mailto:[e-mail]] 
>>Sent: Thursday, October 26, 2006 11:07 PM
>>To: Francois Audet; Hadriel Kaplan; [e-mail]
>>Subject: RE: [MMUSIC] RE: I-D 
>>ACTION:draft-kaplan-mmusic-best-effort-srtp-01.txt
>>
>>Francois,
>>
>>Yes, that would work.
>>
>>John 
>>
>>
>>>-----Original Message-----
>>>From: Francois Audet [mailto:[e-mail]] 
>>>Sent: 27 October 2006 01:22
>>>To: Elwell, John; Hadriel Kaplan; [e-mail]
>>>Subject: RE: [MMUSIC] RE: I-D 
>>>ACTION:draft-kaplan-mmusic-best-effort-srtp-01.txt
>>>
>>>Maybe we could use one a=srtp line for crypto, and another one for
>>>kmgmt?
>>>
>>>(i.e., have a different PT for each?) 
>>>
>>>
>>>>-----Original Message-----
>>>>From: Elwell, John [mailto:[e-mail]] 
>>>>Sent: Thursday, October 26, 2006 5:56 AM
>>>>To: Hadriel Kaplan; Audet, Francois (SC100:3055); [e-mail]
>>>>Subject: [MMUSIC] RE: I-D 
>>>>ACTION:draft-kaplan-mmusic-best-effort-srtp-01.txt
>>>>
>>>>Hadriel, Francois,
>>>>
>>>>Thanks for working on this update. Just one point. If both 
>>>>SDescriptions and MIKEY are offered (inclusion of a=crypto 
>>>>and a=key-mgmt lines) and a different payload type is also 
>>>>indicated for SRTP, this payload type would apply whether the 
>>>>SDescription-derived key or the MIKEY-derived key is used.
>>>>So until the SDP answer arrives, it would still not be 
>>>>possible to render SRTP. Of course, in the case of 
>>>>SDescriptions it is not possible anyway, but in the case of 
>>>>certain MIKEY options it ought to be possible. Unfortunately 
>>>>to resolve this we would need somewhat more complex syntax in 
>>>>the a=srtp line.
>>>>
>>>>John
>>>>
>>>>
>>>>>-----Original Message-----
>>>>>From: [e-mail] [mailto:[e-mail]]
>>>>>Sent: 25 October 2006 20:50
>>>>>To: [e-mail]
>>>>>Subject: I-D ACTION:draft-kaplan-mmusic-best-effort-srtp-01.txt
>>>>>
>>>>>A New Internet-Draft is available from the on-line 
>>>
>>>Internet-Drafts 
>>>
>>>>>directories.
>>>>>
>>>>>
>>>>>	Title		: Session Description Protocol (SDP) 
>>>>>Offer/Answer Negotiation For Best-Effort Secure Real-Time 
>>>
>>>Transport 
>>>
>>>>>Protocol
>>>>>	Author(s)	: F. Audet, H. Kaplan
>>>>>	Filename	: 
>>
>>draft-kaplan-mmusic-best-effort-srtp-01.txt
>>
>>>>>	Pages		: 17
>>>>>	Date		: 2006-10-25
>>>>>	
>>>>>This document defines the requirements and a proposed 
>>>
>>>solution for 
>>>
>>>>>   an SDP Offer/Answer exchange model for negotiating 
>>>>
>>>>best-effort SRTP
>>>>
>>>>>   keys, i.e., in a backward-compatible manner with 
>>>>
>>>>non-SRTP devices.
>>>>
>>>>>   The proposed solution is a trivial interpretation of the 
>>>>
>>>>usage of 
>>>>
>>>>>   the profile and the usage of SDP indication of [sdesc] 
>>>>
>>>>and [kmgmt].
>>>>
>>>>>A URL for this Internet-Draft is:
>>>>>http://www.ietf.org/internet-drafts/draft-kaplan-mmusic-best-e
>>>>>ffort-srtp-01.txt
>>>>>
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