EXPERT SYSTEM FOR COMPUTER SECURITY: DATA ENCRYPTION, DECRYPTION AND KEY HASH ALGORITHMS

ABSTRACT

Encryption attempts to ensure secrecy in communications, such as those of spies, military leaders, and diplomats, but it have also had religious applications. The problem is security. The password method used in almost all commercial operating systems is probably not very strong against a sophisticated or unsophisticated attacker. The aim of the study is to design and implement an Expert System for Computer Security using Data Encryption, Decryption and Key Hash Algorithms. In achieving this aim, the following specific objectives were laid out as follows to develop an application software that will provide a means of safeguarding data in a system and facilitate the use of more sophisticated tool against hacking, cracking, bugging of a system. The motivation that led to the implementation of the proposed system is that the password method used in almost all commercial operating systems is probably not very strong against a sophisticated or unsophisticated attacker. The methodology adopted in this study is the structure system analysis and design methodology (SSADM) which is a technical approach for analyzing and designing an application or system by applying object oriented programming as well as visual modeling throughout the software development process. The programming language used is HTML, CSS, JAVASCRIPT, PHP, SQL and JQUERY. The reason why web programming languages was used is because, it is platform independent and it is a web based application. This study serves as a contribution towards improving information, data and information security on computerized information systems especially for organizations where data is transferred from one point to another. It will contribute in solving the problems of insecurity on both networks for individual computers on a network.

CHAPTER ONE

1.1 Introduction

In the past, security was simply a matter of locking the door or storing files in a locked filing cabinet or safe. Today, paper is no longer the only medium of choice for housing information. Files are stored in computer databases as well as file cabinets. Hard drives and floppy disks hold many of our secret information. In the physical world, security is a fairly simple concept. If the locks on your house’s doors and windows are so strong that a thief cannot break in to steal your belongings, the house is secure. For further protection against intruders breaking through the locks, you might have security alarms. Similarly, if someone tries to fraudulently withdraw money from your bank account but the teller asks for identification and does not trust the thief’s story, your money is secure. When you sign a contract with another person, the signatures are the legal driving force that impels both parties to honor their word.

In the digital world, security works in a similar way. One concept is privacy, meaning that no one can break into files to read your sensitive data (such as medical records) or steal money (by, for example, obtaining credit card numbers or online brokerage accounts information). Privacy is the lock on the door. Another concept, data integrity, refers to a mechanism that tells us when something has been altered. That’s the alarm. By applying the practice of authentication, we can verify identities. That’s comparable to the ID required to withdraw money from a bank account (or conduct a transaction with an online broker). And finally, non repudiation is a legal driving force that impels people to honor their word.

As the Internet becomes a more pervasive part of daily life, the need for e-security becomes even more critical. Any organization engaged in online activity must assess and manage the e-security risks associated with this activity. Effective use of cryptographic techniques is at the core of many of these risk-management strategies. The most important security tool is cryptography.

1.2 Background of the Study

Before the modern era, cryptography was concerned solely with message confidentiality (i.e., encryption) − conversion of messages from a comprehensible form into an incomprehensible one, and back again at the other end, rendering it unreadable by interceptors or eavesdroppers without secret knowledge (namely, the key needed for decryption of that message). In recent decades, the field has expanded beyond confidentiality concerns to include techniques for message integrity checking, sender/receiver identity authentication, digital signatures, interactive proofs, and secure computation, amongst others.

Encryption attempts to ensure secrecy in communications, such as those of spies, military leaders, and diplomats, but it have also had religious applications. Steganography (i.e., hiding even the existence of a message so as to keep it confidential) was also first developed in ancient times. An early example, from Herodotus, concealed a message − a tattoo on a slave’s shaved head − under the regrown hair. More modern examples of steganography include the use of invisible ink, microdots, and digital watermarks to conceal information.

1.3 Statement of the Problem

The problem is security. The password method used in almost all commercial operating systems is probably not very strong against a sophisticated or unsophisticated attacker.

The choice of data encryption comes next in the minds of those that want reduction of unauthorized access on confidential files or data. Security provided by the computer operating systems come with a preset super user account and password.

The super user may have a password to control network functionality, another to conduct or access nightly backups, create accounts, and so on. For a cracker, logging on to a system as the super user is possibly the best way to collect data or do damage. If the super user has not changed an operating system’s preprogrammed passwords, the network is vulnerable to attack.

Most crackers know these passwords, and their first attempt to break into a network is simply to try them. If an attacker cannot log on as the super user, the next best thing might be to figure out the user name and password of a regular user.

It is used to be standard practice in most Universities and colleges, and in some commercial companies, to assign every student or employee an account with user name and initial password − the password being the user name. Everyone was instructed to log on and change the password, but often, hackers and crackers logged on before legitimate users had a chance.

1.4 Aim and objective of the Study

The aim of the study is to design and implement an Expert System for Computer Security using Data Encryption, Decryption and Key Hash Algorithms. In achieving this aim, the following specific objectives were laid out as follows to develop an application software that will:

Understand and improve the computer data security through encryption of data;
Provide a means of safeguarding data in a system;
Enhance the integrity of data and complement physical security; and
Facilitate the use of more sophisticated tool against hacking, cracking, bugging of a system.

1.5 Scope of the Study

The scope of study focuses on computer security data encryption, decryption and key hash algorithm in a multimedia data system.

1.6 Significant of the Study

Data security in these contemporary times is a must. For your secrets to be secure, it may be necessary to add protections not provided by your computer operating systems. The built-in protections may be adequate in some cases. If no one ever tries to break into or steal data from a particular computer, its data will be safe. Or if the intruder has not learned how to get around the simple default mechanisms, they’re sufficient. But many attackers do have the skills and resources to break various security systems. If you decide to do nothing and hope that no skilled cracker targets your information, you may get lucky, and nothing bad will happen.

One of the most important tools for protecting your data from an authorized access is Data Encryption, any of various methods that are used to turn readable files into gibberish. Even if an attacker obtains the contents of the file, it is gibberish. It does not matter whether or not the operating system protections worked.

1.7 Limitations of the Study

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

Time Constraint: The time frame given to accomplish this project was very short due to school academic calendar and it was carried out under pressure which made the researcher not to implement some necessary features.
Establishment Policies: Establishment policies posed a serious limitation as most staffs are not ready to release information needed for this project work. There were lots of information needed from the staffs of this institution to enhance the study which took them time to release or they did not release at all for security purposes, hence the scope was reduced.

1.8 Definition of Terms

Based on this research work, the following terms are used, and briefly defined bellow;

Encryption: A process of converting data/information into another form.

Decryption: A process of converting data/information (multimedia) back to its Original form.

…

CHAPTER TWO

2.0 Literature Review

2.1 Introduction

The review of relevant literature is the main topic of this chapter. A literature review covers theoretical and methodological contributions to a certain issue in addition to the state of knowledge at the time of writing. It provides information about the state of the art in relation to the subject you are writing about. It examines the body of work on the chosen subject. The literature evaluation in this study comprises the …

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Preliminary Pages,
Chapter 1-5,
References and Appendix.

TABLE OF CONTENTS
PRELIMINARY PAGES

Title page
Approval page
Dedication
Acknowledgement
Table of Contents
Abstract
CHAPTER ONE
INTRODUCTION
1.1 Introduction
1.2 Background of the Study
1.3 Statement of the Problem
1.4 Aim and objective of the Study
1.5 Scope of the Study
1.6 Significant of the Study
1.7 Limitations of the study
1.8 Definition of Terms
CHAPTER TWO
LITERATURE REVIEW
2.1 Introduction
2.2 The Concept of Crypto security
2.3 Cryptography
2.3 DES – Data Encryption Standard
2.4 PGP – Pretty Good Privacy
2.5 Diffe-Hellman-Merkel Key Exchange
2.6 RSA- Rivest, Shamir and Adleman
2.7 The Impact of Modern Electronics On Crypto-graphical Systems
2.8 Application of Cryptology in Private and Commercial Life
2.9 Cryptography Keys
2.9.1 Symmetric-Key Cryptography
2.10 Ciphers
2.10.1 Substitution Ciphers
2.10.2 Transposition Cipher
2.11 Public Key Cryptography
2.11.1 Public-Key Certification
2.11.2 Certification Authority (CA)
2.12 Message Security
2.12.1 Message Privacy
2.12.2 Privacy with Symmetric-Key Cryptography
2.12.3 Privacy with Public Cryptography
2.12.4 Message Authentication
2.12.5 Integrity
2.12.6 Non-repudiation or Data origin
2.13 Digital Signature
2.14 Signing the Digest
2.15 Key Management
2.15.1 Symmetric Key Distribution
2.15.2 Certification Authority (CA)
2.15.3 Session Keys
2.15.4 Diffie – Hellman method
2.15.5 Prerequisites
2.15.6 Procedure
CHAPTER THREE
SYSTEM ANALYSIS AND DESIGN
3.1 Methodology Adopted
3.1.1 Problem Identification Using SSADM
3.2 Analysis of the Existing System
3.2.1 Dataflow of the Existing System
3.2.2 Disadvantages of the Existing System
3.3 Analysis of the Proposed System
3.3.1 Data Flow Diagram of the Proposed System
3.3.2 Advantages of the Proposed System
3.3.3 Justification of the Proposed System
3.4 Functional Requirements
3.5 Data Requirements
3.6 High Level Model of the Proposed System
CHAPTER FOUR
SYSTEM DESIGN AND IMPLEMENTATION
4.1 Objectives of the Design
4.2 Cohesion and Decomposition High level Model
4.3 Control Center / Overall Dataflow Diagram
4.3.1 Proposed System Operation Flowchart
4.3.2 Algorithm
4.4 System Specification and Design
4.4.1 Input and Output Specification
4.4.2 Database Specification and Design
4.4.3 Data Dictionary
4.5 Choice and Justification of Programming Language
4.6 Program Documentation
4.7 Implementation Techniques
4.8 Programming Module Specification
4.8.1 Installation
4.9 Computer Hardware Minimum Requirement
4.10 Software Requirement
4.11 Personnel / User Training
CHAPTER FIVE
SUMMARY, CONCLUSION AND RECOMMENDATION
5.1 Summary
5.2 Conclusion
5.3 Recommendation
REFERENCES
APPENDIX A - "SOURCE CODE"
APPENDIX B - "OBJECT PROGRAM"

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