VoIP, Tor and Zfone by Phillip Zimmermann?

Anothony Georgeo anogeorgeo at yahoo.com
Tue May 16 14:21:58 UTC 2006

Good day,

I was thinking of routing a VoIP call (SIP protocol)
via. a VoIP client into Phillip Zimmermann's new
"Zfone" (
http://www.philzimmermann.com/EN/zfone/index.html )and
then into Tor before the VoIP call reaches the other

One problem I see is that most VoIP clients use UDP (I
think) and so does Zfone.  But, Zfone has a proxy
configuration window (I think) which may route into
TCP/IP.  I only have a windows box and the Windows
Zfone isn't released yet.

I was thinking of routing a VoIP call via. a VoIP
clinet into Zfone (port 5060) then into Tor (via.
Torcap with Zfone).  Does Torcap do UDP to TCP/IP?

Another idea is to communicate with other parties via.
Tor's Hidden Services(HS).  Can HS be configured to
route a VoIP call?  Could a HS .onion address is used
inplace of the other parties VoIP number in a VoIP

Does anyone know of a good, open-source and free VoIP
clinet for Windows XP/NT?

-Slighlty off topic-

What the Tor community really needs is a "UDP to
TCP/IP" library for Tor (if that's even possible). 
This way UDP protocol specific programs could be used
with Tor.  I know "TCP/IP to UDP" library is possbile
as UDP is the underlying protocol for TCP/IP (I

-Back to topic-

Zfone runs in the IP stack and detects a VoIP call
when it starts.  Zfone then captures, secures (eg.
authenticates) and encrypts all VoIP packets 'on the
fly'.  Zfone creates an end-to-end tunnel to other
Zfone users via. TLS and it also uses DH key
agrements.  Zfone also offers defense from MiTH
attacks via. a short authentication code that appears
in all parties Zfone GUI to be read over the phone for

Any opinions, thoughts?

Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 

More information about the tor-talk mailing list