juliusikkala/otpchat

One-time pad chat

OTPCHAT

A simple chat program which uses one-time pads for encryption. Each user has their own personal key which their client uses to encrypt the messages. The key must be transferred physically, e.g. on a USB drive. Receiving users must have a copy of the sender's key in order to decrypt the data.

Use at your own risk! There is no guarantee that the program is secure. Furthermore, there is no warranty of any kind. See the "LICENSE" file for legal details.

Usage

Generating keys

otpchat --generate <size> <new-key-file>

Generates a key from /dev/urandom.

Generate at least two keys, one for yourself and one for the person you want to chat with. Transfer both of the keys to the person on a physical medium such as a thumb drive.

Chatting

In all cases, you have to specify your local key and the expected remote key.

otpchat <local-key> <remote-key> [port]

Starts listening on port 14137 unless another port is specified.

otpchat <local-key> <remote-key> <address>[:<port>]

Attempts to connect to the given address and port. If the port isn't specified, defaults to port 14137.

Commands

A command is preceded by '/'. For example, the command to quit the program is "/quit".

Command	Arguments	Function
quit		Quits the program
connect	address[:port]	Connects to the given address
disconnect		Disconnects from the current session
listen	[port]	Starts listening for connections
endlisten		Stops listening for connections