yuanqili / arcade-haven Goto Github PK

Goal: Messages are encrypted and then transmitted through the server (stored in server's database), but the server doesn't know anything about the message. It just passes the message to the target client.

Idea: Using public/private key pair.

Detail:

• PA, VA: public and private key of Alice, PB, VB: public and private key of Bob.
• Server will store all users' public keys.
• For a message msg, Alice sends PA(msg) and PB(msg), i.e., the message encrypted using Alice's public key and Bob's public key.
• Server will sends PB(msg) to Bob. Bob is able to view the message by VB(PB(msg)) using his private key.
• If Alice wants to view her message history, she can acquire PA(msg) from the server, and decrypt using her private key VA.

Log
Message transmission/broadcasting

• Sender and Listener should be loosely coupled. Current Listener needs the socket created by the Sender. There should be a super class of Sender and Listener.
• Sender needs User object to extract user's uid. While this is unnecessary because the server will definitely know user's uid.

Records user log in/off, telling the IM server user activities. Validate login information via SQL server.

database connection and schema