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

["Hadriel Kaplan" <[e-mail]>]

I wouldn't think zrtp would need port-mapping.  They're supposed to
handshake in clear RTP (or maybe rtcp depending on how the argument in AVT
ends up).  So they should be able to use the m= line ones.  I would expect
that any media-plane key exchange mechanism would be designed such that it
gracefully fails if either side doesn't support it, no?  They may need/want
an attribute so the offerer can tell the answerer to try it, or other info
like a fingerprint, but port-mapping wouldn't be one of them, would it?

-hadriel

> -----Original Message-----
> From: Elwell, John [mailto:[e-mail]]
> Sent: Sunday, October 29, 2006 4:20 AM
> To: Dan Wing; 'Francois Audet'; 'Hadriel Kaplan'; [e-mail]
> Subject: RE: [MMUSIC] RE: I-D ACTION:draft-kaplan-mmusic-best-effort-srtp-
> 01.txt
> 
> Dan,
> 
> It would probably need to be something like:
> a=srtp key-mgmt:0=96,18=97 crypto:0=98,18=99 fingerprint:0=100,18=101
> zrtp:0=102,18=103
> 
> John
> 
> > -----Original Message-----
> > From: Dan Wing [mailto:[e-mail]]
> > Sent: 27 October 2006 18:46
> > To: Elwell, John; 'Francois Audet'; 'Hadriel Kaplan'; [e-mail]
> > Subject: RE: [MMUSIC] RE: I-D
> > ACTION:draft-kaplan-mmusic-best-effort-srtp-01.txt
> >
> > 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
> > > > > >
> > > > > > To remove yourself from the I-D Announcement list, send a
> > > > > message to
> > > > > > [e-mail] with the word unsubscribe in
> > > > > the body of
> > > > > > the message.
> > > > > > You can also visit
> > > > > > https://www1.ietf.org/mailman/listinfo/I-D-announce
> > > > > > to change your subscription settings.
> > > > > >
> > > > > > Internet-Drafts are also available by anonymous FTP.
> > > > Login with the
> > > > > > username "anonymous" and a password of your e-mail
> > > address. After
> > > > > > logging in, type "cd internet-drafts" and then "get
> > > > > > draft-kaplan-mmusic-best-effort-srtp-01.txt".
> > > > > >
> > > > > > A list of Internet-Drafts directories can be found in
> > > > > > http://www.ietf.org/shadow.html or
> > > > > > ftp://ftp.ietf.org/ietf/1shadow-sites.txt
> > > > > >
> > > > > > Internet-Drafts can also be obtained by e-mail.
> > > > > >
> > > > > > Send a message to:
> > > > > > 	[e-mail].
> > > > > > In the body type:
> > > > > > 	"FILE
> > > > > > /internet-drafts/draft-kaplan-mmusic-best-effort-srtp-01.txt".
> > > > > >
> > > > > > NOTE:	The mail server at ietf.org can return the document
in
> > > > > > 	MIME-encoded form by using the "mpack" utility.
> > >  To use this
> > > > > > 	feature, insert the command "ENCODING mime"
> > > before the "FILE"
> > > > > > 	command.  To decode the response(s), you will
> > > need "munpack" or
> > > > > > 	a MIME-compliant mail reader.  Different MIME-compliant
> > > > > mail readers
> > > > > > 	exhibit different behavior, especially when dealing with
> > > > > > 	"multipart" MIME messages (i.e. documents which
> > > have been split
> > > > > > 	up into multiple messages), so check your local
> > > documentation on
> > > > > > 	how to manipulate these messages.
> > > > > >
> > > > > > Below is the data which will enable a MIME compliant
> > > mail reader
> > > > > > implementation to automatically retrieve the ASCII
> > > version of the
> > > > > > Internet-Draft.
> > > > > >
> > > > >
> > > > > _______________________________________________
> > > > > mmusic mailing list
> > > > > [e-mail]
> > > > > https://www1.ietf.org/mailman/listinfo/mmusic
> > > > >
> > > >
> > >
> > > _______________________________________________
> > > mmusic mailing list
> > > [e-mail]
> > > https://www1.ietf.org/mailman/listinfo/mmusic
> >


_______________________________________________
mmusic mailing list
[e-mail]
https://www1.ietf.org/mailman/listinfo/mmusic