End to End messaging system like WhatsApp

The below functionalities are designed using following commands:

1. Multiclient chat application that has a server component and as many no. of clients.
2. The system supports the signup and sign in feature.
3. User can send message to other user [p2p message] : send
4. Each user can join multiple chat rooms (groups) at a time.
5. Each user can list all the groups (show all group and number of participants in each group) :
6. Each user can join a group using . If the group does not exist then the first create it then joins it.
7. Each user can create a group using .
8. If one user sends a message to a group it should be sent to all members of that group.
9. The message is encrypted using Tripple DES (3DES) and the key will be Diffie–Hellman key type exchanged between clients.
10. For each group one key (random nonce) is generated and messages are encrypted through this key and sent to each user.
11. Message can be any type, for example, text, images, video, and audio.

LIST OF COMMANDS:

• Send a message to User: SEND USERNAME MESSAGE
• Send a multimedia to User: SEND FILE USERNAME MESSAGE
• Send a message to Group: SEND GROUPNAME MESSAGE
• Send a multimedia to Group: SEND FILE GROUPNAME MESSAGE
• Create Group: CREATE GROUPNAME
• Join Group: JOIN GROUPNAME
• Prints list of all the Group: LIST GROUPS

INSTRUCTIONS TO RUN THE CODE:

• python3 server.py
• python3 client.py

EXTERNAL LIBRARIES

• binascii
• hashlib
• socket
• Thread
• DES3
• nacl.secret
• nacl.utils
• nacl.pwhash
• os
• pyDH
• sys
• base64

TEAM MEMBERS

• Anchal Soni - 2020201099
• Param Pujara - 2020202008
• Somya Lalwani - 2020201092
• Utkarsh MK - 2020201027