Private Messenger

Java based project

Introducton

• The main goal of my project was to create an instant messaging system which would be both secure and scalable. Additionally, I wanted this system to have a reasonable set of functionalities. In other words, we have to provide everything that is necessary to make it a convenient tool without overloading it with all the bells and whistles that can be found in commercial applications.

Problem Statement

• Confidentiality of messages• Authenticity of messages• Flooding

Research paper

• From IEEE publications• Based on LAN services• Summary of the paper:• : This study used socket concept to collect message.

Basically the message sent by one staff in to a socket and pass it to another staff on the receiving side. If it is a group chatting, a central socket will be used to collect the message and then it will be broadcast to all staff that is active. The relatively amorphous nature of synchronous messaging allows it to potentially support many different types of communication

Architecture

The private messenger works with the help of server module with which every user connects using the IP address of the server computer and the port number for the TCP/IP connection. Server gives the information regarding the every connected computer and also tells where the packet is to be delivered.

Layers of client and server

Application layer is the top most layer of TCP/IP model. Application layer defines TCP/IP application protocol and how host program interface with the transport layer services to use the network. Next layer is our transport layer it is positioned in between application and the internet layer. The purpose of the transport layer is to permit devices on the source and the destination host to carry on a conversation. Next is our internet layer which packs data into data packets which contains source and destination address information that is used to forward the data packets between host and across network and the last is our network access which defines details of how data is physically sent through the network with the help of devices which are interfaced directly to the network medium such as optical fiber or coaxial cables.

Implementation

• The Application continuously connected with the server by sending information to it.

• When any chat request passes through, the information is analyzed by application layer and it returns the User Name and Client location where the information have to been send.

• Then the TCP socket provide this information to server using Physical layer or Network (Local Area Network or Private Server with Public IP)

Result

• Till now message transferring and receiving is successfully implemented

• File transfer is also working .• I hope to add some more features and hope to

implement the cryptology in the project.

Thankyou!