For those who may be curious, I was recently sent some information on
   the history of CSpace.  The info has been included in the README:
   [1]https://github.com/jmcvetta/cspace#history
   Please note I have no insight into the accuracy of this history.  It
   was provided unsolicited by a person I've never met.

   On Wed, Dec 31, 2014 at 12:26 PM, Seth <[2]list@sysfu.com> wrote:

     On Sun, 28 Dec 2014 16:51:44 -0800, Seth <[3]list@sysfu.com> wrote:

     "Things become "catastrophic" for the NSA at level five - when, for
     example, a subject uses a combination of Tor, another anonymization
     service, the instant messaging system CSpace and a system for
     Internet telephony (voice over IP) called ZRTP. This type of
     combination results in a "near-total loss/lack of insight to target
     communications, presence," the NSA document states.

     John Gilmore dug up the Cspace software (see below), and I believe
     this is the Trilight software/service mentioned in the NSA docs:
     [4]https://www.trilightzone.org/
     Return-Path: <gnu[at][5]new.toad.com>
     Received: from [6]new.toad.com (localhost.localdomain [127.0.0.1])
             by [7]new.toad.com (8.12.9/8.12.9) with ESMTP id
     sBV5oaCl013715;
             Tue, 30 Dec 2014 21:50:36 -0800
     Message-Id: <201412310550.sBV5oaCl013715[at][8]new.toad.com>
     To: cryptography[at][9]metzdowd.com, gnu[at][10]toad.com
     Subject: "Catastrophic" for NSA: Tor+ Trilight Zone + Cspace + ZRTP
     on Linux
     Date: Tue, 30 Dec 2014 21:50:36 -0800
     From: John Gilmore <gnu[at][11]new.toad.com>
     Nice to hear that there's some software that makes NSA go deaf, dumb
     and blind.  Here is the Snowden release that mentions it (page 20):
       "Presentation from the SIGDEV Conference 2012 explaining which
     encryption protocols and techniques can be attacked and which not"
       [12]http://www.spiegel.de/media/media-35535.pdf
     I found cspace ([13]http://cspace.aabdalla.com/), which was a bit
     obscure
     and hasn't seen any maintenance since 2009 or so.  Its dependency
     ncrypt-0.6.4's source code is at Pypi and ncrypt-0.6.4 is in current
     Ubuntu distros.
     But I haven't yet found Trilight Zone.  Any clues?
     And I haven't found a reliable, usable, simple, free software VoIP
     client for Linux, let alone one that uses ZRTP.  Though I admit I
     gave
     up on looking about a year ago when I couldn't get anything to
     actually work.
             John

References

   1. https://github.com/jmcvetta/cspace#history
   2. mailto:list@sysfu.com
   3. mailto:list@sysfu.com
   4. https://www.trilightzone.org/
   5. http://new.toad.com/
   6. http://new.toad.com/
   7. http://new.toad.com/
   8. http://new.toad.com/
   9. http://metzdowd.com/
  10. http://toad.com/
  11. http://new.toad.com/
  12. http://www.spiegel.de/media/media-35535.pdf
  13. http://cspace.aabdalla.com/