Windows Messenger Media Encryption

  • Thread starter Thread starter chk
  • Start date Start date
C

chk

Windows Messenger 5.X has the option to enrypt voice and video conversations
(the media stream, not the signaling), does anybody know how this is
implemented ? Is SRTP used ?

chris.
 
Second try with this one, does nobody knoiw how the enryption is
implemented, not even the MSFT guys ??
 
Hello Chris,

sorry for the delay. I've been pretty busy lately.
Second try with this one, does nobody knoiw how the enryption is
implemented, not even the MSFT guys ??
Click to expand...

the encryption is based on DES for audio and video (AFAIR using 56-bit
encryption) and on TLS for data collaboration.

HTH

Regards
 
chk said:
Hm, 56bit DES ... not quite impressive. :)
Does it conform to the SRTP standard, meaning is it
compatible with over SIP devices ?
Click to expand...

I guess not, but I don't know for sure. The RTC
Protocols and Technologies doc doesn't mention
SRTP in any way and I also don't remeber any
note on the NetMeeting documentation.

Regards
 
Hello all,
encryption makes sense,
but I don´t know how to force Messenger to use encryption.
I´m pretty sure, that I can do this with a GPO, but I don´t know which value
is responsible for that.
I found:
"Require SIP high-security mode"
and
"Specify encryption for computer-to-computer audio and video calls" .
I set both to enable, but when I trace a voice conversation between two
messenger users, the UDP/RTP packets seems not to be encrypted (Codec 111 is
shown, which might be SIREN.).
Can you give me a definition of these two options?

I´m using TLS for encryption of the signalling and a LCS2003 .

Thanks for help !

Roland

Thomas Wenzl said:
chk said:
Hm, 56bit DES ... not quite impressive. :)
Does it conform to the SRTP standard, meaning is it
compatible with over SIP devices ?
Click to expand...

I guess not, but I don't know for sure. The RTC
Protocols and Technologies doc doesn't mention
SRTP in any way and I also don't remeber any
note on the NetMeeting documentation.

Regards
--
Thomas Wenzl [MVP for Live Communications Server]

Share what you know, learn what you don't!
(Deja/Google)
Click to expand...
 
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