END TO END MESSAGING SYSTEM

Prerequisites and Installation

• Threading pip3 install threading
• Socket pip3 install socket
• Os pip3 install os
• Sys pip3 install sys
• Hashlib pip3 install hashlib
• Crypto pip3 install Crypto
• Time pip3 install time
• Base64 pip3 install bas64
• Sqlite3 pip3 install sqlite3
• JSON pip3 install json
• Random pip3 install random
• Subprocess pip3 install subprocess

FLOW AND WORKING

• A automated program is executed to start desired number of Servers for the application. python3 automate_program.py <Number of servers>
• Loadbalancer program is started on specified Port number, which uniformly distributes the requests from the different different clients to different Servers accordingly. python3 loadbalancer.py <LoadBalancerPort>
• Various Clients program are started on different Port nos and all clients are binded to the Loadbalancer. python3 client.py <clientPort> <LoadBalancerPort>
• Clients can directly send to messages or any file to other clients. Clients can created or join various groups and then send messages or files to different different groups.
• All the messages and files are encrypted using Triple DES (3DES) encyrption algorithm. Keys between clients are shared using Diffie–Hellman key key exchange algorithm

Various Commands for Client

• Sign up <username> <rollnumber> <password> - For signing up clients for first time.
• Login <usernamer+rollnumber> <password> - For logging into their account.
• Send <Name+Rollno.> <message> - Sending message to any specific client.
• Send_file file_name <Name||Rollno.> -Sending File to any specific client.
• Send_group <No.ofgroups> <Groupno.(s)> <message> - Sending group message.
• Send_group_File <File_Name> <No.ofgroups> <Groupno.(s)> Sending group file.
• Create <Groupname> -Creating a new Group.
• Join <Groupname> - Joining Specific Group.
• Show_my_groups - Displaying groups where I am a member
• List - Listing avaliable groups to join.

Interaction Model

Class Diagram

Snapshots of the Application with various Commands

• Automate program to create multiple servers

• Sign Up

• Login Menu , List , Create, Join Commands

• Messages between Client to Client and Client to Groups.