Secure Calling; GNU ccrtp 1.5/new libzrtpcpp released today

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Starting today we are releasing GNU ccrtp 1.5.0, with support for the
"Secure RTP profile", RFC 3711, which allows for secure connections, and 
voice encryption using either libgcrypt or openssl backends.  In 
addition, we are releasing native support for Phil Zimmermann's ZRTP 
protocol, which offers a transparent way to transfer encrypted voice 
over existing infrastructure.  This work was completed with the 
incredible effort of Werner Dittmann, and extensive help by Michel de 
Boer, who works on the Twinkle Softphone.

These efforts together represent the first step of how I envision we 
will provide intercept-free privacy enhancing communications worldwide, 
both privately and over the public Internet.  In addition, it has been 
well demonstrated by recent events how important it is to secure call 
session information from passive data mining, which we will do through 
TLS enabled SIP in the future, and to obscure the ip address of 
communicating endpoints, such as through the use of anonymous RTP
proxies.  Both of these capabilities will be developed through future 
releases of GNU Bayonne, starting with a sips (tls sip/srtp) session 
driver, with zrtp passive pass-through, and later some more interesting 
capabilities to forward publish and share contact information.

The results of this work is immediately usable by everyone today, 
starting with GNU ccrtp 1.5.0, the new libzrtpcpp 0.9.0, and the 0.9 
release of the Twinkle softphone client, which now implements the SRTP 
and ZRTP functions offered in our new release of GNU ccrtp.

I will comment much more on Secure Calling in the near future.

Downloads:

http://ftp.gnu.org/pub/gnu/commoncpp/commoncpp2-1.5.0.tar.gz
http://ftp.gnu.org/pub/gnu/ccrtp/ccrtp-1.5.0.tar.gz
http://ftp.gnu.org/pub/gnu/ccrtp/libzrtpcpp-0.9.0.tar.gz
http://www.xs4all.nl/~mfnboer/twinkle/download/twinkle-0.9.tar.gz
Some additional resources:

Phil Zimmerman's zrtp specification;
http://www.infosecwriters.com/text_resources/pdf/Zfone_SSotillo.pdf.

Zfone project; http://www.philzimmermann.com/zfoneproject/index.html.

GNU Telephony Secure Calling;
http://wiki.gnutelephony.org/index.php/Secure_Call.

Twinkle Softphone;
http://www.twinklephone.com/.








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