CSpace is peer-to-peer communication software of unknown origin, claiming to offer users an unusually high degree of privacy.
Descriptions of CSpace are available at anonymous-p2p.org and on the Planet Peer forum. It is unknown whether these descriptions were written by the CSpace author(s).
CSpace was brought to public attention by mention in a document (www.spiegel.de/media/media-35535.pdf, page 20) purportedly leaked by NSA whistleblower Edward Snowden. The document suggests use of CSpace, in conjunction with other named tools, may result in NSA's "near-total loss/lack of insight to target communications, presence".
The CSpace source code was downloaded from cspace.aabdalla.com on 31 December 2014. The code was freely available to the public for download, and no copyright or license statements could be found therein or on the hosting site. I am therefore making a good faith assumption that it is public domain (or analagous legal construct, as appropriate). The draft CSpace Wikipedia page lists the license as GPL, but I can find no other evidence to support that claim.
If you find CSpace interesting, you may wish to clone this repo to your local computer, in case it gets censored in the future.
I did not write CSpace; do not use it; do not have any insight into its original authorship or purposes; have not reviewed the code in any meaningful way; cannot help you with bugs/support/etc; and do not assert the truth or falsehood of the CSpace privacy claims.
I have no freakin' idea if this software works at all. I have uploaded the source to Github to foster healthy, open civic debate.
There is a decent chance that users of this software will experience increased surveillance and resultingly decreased personal privacy.
Do not use this software; or if you must, use it at your own risk.