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     CSpace
CSpace Logo"CSpace provides a platform for secure, decentralized, user-to-user communication over the internet. The driving idea behind the CSpace platform is to provide a connect(user,service) primitive, similar to the sockets API connect(ip,port). Applications built on top of CSpace can simply invoke connect(user,service) to establish a connection. The CSpace platform will take care of locating the user and creating a secure, nat/firewall friendly connection. Thus the application developers are relieved of the burden of connection establishment, and can focus on the application-level logic!

CSpace is developed in Python. It uses OpenSSL for crypto, and Qt for the GUI. CSpace is licensed under the GPL.

What applications are available now?

The following applications are currently available with CSpace:

  • Text Chat
  • File Transfer
  • Remote Desktop (based on VNC)

How does it work?

Here are some of the salient points regarding the CSpace architecture:

User Identity

  • All users create 2048-bit RSA keys for themselves.
  • A user is uniquely identified by his RSA public key.
  • Every user has a contact list, which is just a list of public keys known to that user.
  • A user assigns names to the public keys in his contact list. This is done because it is easier to display & manage names rather than raw public keys.
  • CSpace ensures that there are no duplicate names present in the contact list. This is done to allow a contact name to uniquely identify a public key in the contact list.
  • To help with the exchange of public keys between users, a key server is used (somewhat like PGP key servers).

Decentralized Network

  • A Distributed Hash Table (DHT) based on the Kademlia protocol is used.
  • When a user goes online, a mapping from his public key to his ip-address is created in the DHT.
  • CSpace also registers with third party routers, so that the user can receive connections even if he is behind a nat/firewall.

Connection Process

  • When an application wants to utilize the CSpace platform, it establishes a local connection to the CSpace instance, and issues a connect request, say, something along the lines of connect(alice,TextChat).
  • CSpace obtains the destination user's public key by looking up the name in the contact list.
  • The DHT is used to obtain the destination user's network location (ip address).
  • A TCP connection is established to the destination user's network address. In case the destination user is behind a nat/firewall, then a proxied connection is established using a third party router.
  • A secure channel is established using the TLS protocol.
  • The service name which was requested (say TextChat) is sent over the secure channel, and the destination CSpace instance responds with a success code.
  • The application which issued the connect request is notified about the successful connection. CSpace proxies the data between the local application and the secure channel. Thus the application only sees a plain TCP connection to localhost." --CSpace

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