Terminal based Encrypted Messenger

• Multiclient chat application that has 1 server component and atleast 4 clients.

  

• To ensure secure communication the messages are encrypted using Triple DES(3DES) which is a Symmetric Encryption technique and the secret key used for encryption will be exchanged between the users using Diffie–Hellman key exchange algorithm.

How to run

pip3 install pycryptodome
run server: ./server.py
run client: ./client.py PORT

Features

• Multiclient chat application that has a server component and atleast 4 clients.
• The system supports the signup and sign in feature. [error message with wrong credentials].
• User can send message to other user [p2p message] [ SEND command] []
• Each user can join multiple chat rooms (groups) at a time.
• Each user can list all the groups. [LIST Command] [show all group and number of participants ineach group]
• Each user can join a group [JOIN command]. If the group does not exist then the first create it thenjoins it.
• Each user can create a group [CREATE command].
• If one user sends a message to a group it should be sent to all members of that group.
• The message is encrypted using Tripple DES (3DES) which is a Symmetric Encryption Technique and the secret key exchange algorithm used between the users is Diffie–Hellman.
• Each group has one key (random nonce).
• Message can be any type, for example, text, images, video, and audio.

Commands Implemented

1. create_account
2. login
3. create_group
4. list_groups
5. join_groups
6. text messaging to other clients within network
7. group messaging
8. p2p file sharing
9. group file sharing