24c70c9e84
file_id is a 32byte identifier that can be used by users to identify file tranfers across core/client restarts in order to resume broken file tranfers. In avatar tranfers it corresponds to the hash of the avatar. Added tox_file_get_file_id() function to api to obtain the file_id of an ongoing file transfer. If not set, core will generate a random one.
With the rise of governmental monitoring programs, Tox, a FOSS initiative, aims to be an easy to use, all-in-one communication platform that ensures their users full privacy and secure message delivery.
Website | Wiki | Blog | FAQ | Binaries/Downloads | Clients | Compiling | API | Bugs | Help and Suggestions | IRC Channel: #tox@freenode
The Complex Stuff:
UDP vs. TCP
Tox must use UDP simply because hole punching with TCP is not as reliable. However, Tox does use TCP relays as a fallback if it encounters a firewall that prevents UDP hole punching.
Connecting & Communicating
Every peer is represented as a byte string (the public key [Tox ID] of the peer). By using torrent-style DHT, peers can find the IP of other peers by using their Tox ID. Once the IP is obtained, peers can initiate a secure connection with each other. Once the connection is made, peers can exchange messages, send files, start video chats, etc. using encrypted communications.
Current build status: 
Q&A:
What are your goals with Tox?
We want Tox to be as simple as possible while remaining as secure as possible.
Why are you doing this? There are already a bunch of free Skype alternatives.
The goal of this project is to create a configuration-free P2P Skype replacement. “Configuration-free” means that the user will simply have to open the program and will be capable of adding people and communicating with them without having to set up an account. There are many so-called Skype replacements, but all of them are either hard to configure for the normal user or suffer from being way too centralized.