DESIGN AND IMPLEMENTATION OF NETWORK TRAFFIC MONITORING SYSTEM

1.1 Introduction

Attacks on computer by outside intruder are more publicized but the ones perpetrated by insiders are very common and often more damaging. Insiders represent the greatest threat to computer security because they understand their organization's business and how their computer systems work. They have both the confidentiality and access to perform these attacks. An inside attack will have a higher probability of successfully breaking into the system and extracting critical information. The insiders also represent the greatest challenge to securing the company network because they have authorized level of access to the file system.

In a quest for maximum profitability in a network, there is need to monitor the activities performed such that the network activity in a real time would be tracked, confidential information safeguarded and control over the daily activities of every staff established. Network activity monitoring system is used to detect inside threats by monitoring file access and process activity (Behr et al, 2009). It is a powerful tool that allows one to track any local area network, giving you the most detailed information on when, how and what your network users do on daily basis. If it is a library public network, university or commercial organization network, Activity Monitor offers efficient control. This work targets the monitoring of every activity of a user in a computer network and maximizes the security for the organization or corporate body.

1.2 Background Of Study

The Federal Inland Revenue service (FIRS) is one of the federal ministries charged with the responsibility of accessing, collecting, and accounting for the various taxes to the federal government since 1943. Tax revenue has been reliable from time, from where government rely for decision making, and aids for development and administrative planning, hence the need for optimum human resource of the organization or ministry; for it's considered to be their most valuable asset if properly harnessed and are well motivated to perform their assigned tasks so as to enhance the organizations goals and objectives.

Computer network activity monitoring system has become one of the vital tools in providing evidence in cases such as computer misuse and fraud. Computers and other devices are being used increasingly to commit, enable or support unwanted activity perpetrated against individuals, organizations or assets. Although it is most often associated with the investigation of a wide variety of computer crime, network activity monitoring system may also be used in civil proceedings.

The discipline involves similar techniques and principles to data recovery and a lot of information is retained on the computer than most people realize. It's also more difficult to completely remove information than it is generally thought. For these reasons (and many more), network activity monitoring system can often find evidence or even completely recover lost or deleted information, even if the information was intentionally deleted. This system consist of two tier application – server and client whereby the activity monitoring server can be installed in any computer in the entire local area network and the client which is the remote spy software is installed on all the computers on the network to be monitored.

1.3 Statement Of Problem

The existing system used by FIRS has been a challenge to them. Amongst the problems affecting the FIRS from maintaining a steady reliable accounting figures and estimates are:- With the current system, staffs easily erase or add data in order to cover up their fraud since there is no back up of the activity log. Frauds like computer fraud: - loss or damage to money, securities resulting directly from the use of any computer to fraudulently cause a transfer of money or other property from inside the premises to a person at a place outside the premise.

Their method of operation is not so efficient for both units in the department (Operations and Reconciliation units).Both units cannot work at the same time, and this is because the staffs in one of the unit (reconciliation unit) has to wait for the staffs in the other unit (operation unit) to get their work to some extent before they can process their own work, and while they are processing their own work, the staffs in the operation unit has to pause their work a little, and with this manual of operation in the department, rooms for corporate fraud is being created. These are the more reasons, why the researcher embarked on this research.

1.4 Aim and Objectives Of Study

This project targets towards discovering what should be done to improve the existing system, monitoring the daily activities of every user in a network and using it to provide evidence to frauds or crimes committed using computer technology which some people referred to as digital crime; that is crime committed using a computer system. The objective of this work is to develop a system that should be able to;

1. Monitor the daily activities of every user in a network in real time.
2. Detect active users.
3. Provide accurate evidence on corporate fraud when investigation is being carried out in an organization.
4. Have a good memory management for efficient carrying out of activities.

1.5 Significance Of Study

The significance and benefit of the proposed system includes:

1. Increased employers loyalty: What ultimately creates the employers loyalty is meeting and exceeding their expectation.
2. Maintaining system integrity: Staying current on work status so as to know how well the organization is going.
3. Ensure proper handling of investigation in computing: This is the reason why we need a careful, methodical process for gathering digital data in the first place; and this is why we need network activity monitoring system.
4. Increased employer's retention: The employees are an investment. Generally, it takes nine to twelve months or longer before an employee is a productive asset to a company. If an employee leaves after a year or two, the company has lost most of its investment.
5. Information empowered decision making: Most managers, executives and employers make decisions based upon all relevant information. There are some actions that can have a profound effect on corporate decision making; those actions are more easily justifiable when you have easily accessed the users system.

1.6 Scopes Of The Study

Although a network activity monitoring system involves many things and activities that can be run within it, yet due to lack of time and space, we were not able to use this software in other operating systems apart from windows operating system (that is from windows XP to windows operating system of higher versions). Furthermore this work did also not involve internet connectivity as well as detection of virus in a network.

1.7 Limitations Of The Study

During the course of this study, many things militated against its completion, some of which are;

1. Lack of Finance
2. Refusal of the Federal Inland Revenue Services Port Harcourt, to give detailed answers and in some cases no answer at all to some questions.
3. This project is limited to all the data associated with the information gotten from the Federal Inland Revenue Service commission, and due to time factor, not all the commissions were reached for sources of data and information.

1.8 Definition Of Terms

NAMS (Network activity monitoring system):

This is the system that is used monitor the daily activity of every user on a network

Corporate Fraud:

This is the fraud committed by insiders in a large, publicly traded (or private) corporation, and/or by senior executives.

Real time:

Occurring immediately, this is used for such task as navigation, in which the computer must react to a steady flow of new information without interruption.

LAN (Local Area Network):

This is computer network that spans a relatively small area. Most LANs are confined to a single building or group of buildings.

Suid:

A file attributes which allows a program to run as a specific user no matter who executes it.

Corporate Decision Making:

This is connected with a corporation, this involves the image of a company or organization where all its members involve taking critical decision making (finance/planning/strategy)

Internal Auditor:

An employee of a company charged with providing independent and objective evaluations of the Company's financial and operational business activities, including its corporate governance.

Internal auditors also provide evaluations of operational efficiencies and will usually report to the highest level of management on how to improve the overall structure and practices of the company

External Auditor:

An external auditor is an audit professional who performs an audit in accordance with specific laws or rules on financial statements of a company, government entity, other legal entity or organization