A centralized encrypted messaging python3 implementation packed with a blockchain service It implements Kasumi cipher, RSA / El Gamal signature and Diffie Hellman key exchange protocol
- Bitstring
- Pyfinite
you should start first the server by executing the script server.py
you should lauch clients (client.py) two by two. On startup, each client will ask for the client name and the receiver name.
- Please make sure that the receiver name matches another client before sending anything
- The client will generate a large prime number on startup to init the cryptographic algorithms. This number will be stored on a file, which means that the next startup process will be faster.
- Any text message that is not a command (described bellow) will be send to the receiver client (after beeing cipherd and signed)
- exit: terminates the connection with the server and closes the client script
Those commands should be used only after sending at least one text message to make sure that users send each other their public keys
- /send <amount: float>: executes a transaction from client to receiver with value amount
- /balance: computes and displays on server-side the client's account balance
- /verify: asks the server to verify the blockchain. The server logs the result
