COMPARISM OF SHA 1, SHA 256, AND MD 5 ALGORITHMS

CHAPTER ONE

Introduction

1.1 Background Of The Study

Cryptography is an effective way of protecting sensitive information that is stored on media or transmitted through network communication paths.

Although the ultimate goal of cryptography, and the mechanisms that make it up, is to hide information from unauthorized individuals because most protocols can be broken into and the information can be revealed if the attacker has enough time, desire, and resources. Consequently, a more realistic goal of cryptography is to make obtaining the information too work-intensive to be worthwhile to the attacker and this is done through encryption.

The first encryption methods dated back to four thousand years ago and were considered more of an ancient art. As encryption evolved, it was mainly used to pass messages through hostile environments of war, crisis, and for negotiation processes between conflicting groups of people. Throughout history, individuals and governments have worked to protect communication by encrypting it. As time went on, the encryption algorithms and the devices that used them increased in complexity, new methods and algorithms were continually introduced, and it became an integrated part of the computing world. Smith,A(2004)

While cryptography is the science of securing of data, cryptanalysis is the science of analyzing and breaking secure communication. Cryptology embraces both cryptography and cryptanalysis. In order words, it is the coding of plaintext and at the same time decoding it. (Smith 2004)

Cryptanalysis involves the process of an interesting combination of analytical reasoning, application of mathematical tools, pattern finding, patience, determination and luck. In order words, cryptanalyst are also called attackers.

Data that can be read and understood without any special method is called plaintext or clear text. The method of disguising plaintext in such a way as to hide its substance is encryption. The encrypted plaintext (which is unreadable) is known as the cipher text. The process of converting the cipher text back to the plaintext is decryption.

Cryptography can be strong or weak. The cryptographic strength can be measured in the time and resources it will take to recover the plaintext. (Smith.2004)

Cryptography currently plays a major role in many information technology applications. For example, when engaging in electronic commerce, customers provide their credit cards numbers when purchasing products. If the connection is not secure, an attacker can easily obtain this sensitive data. In order to implement a comprehensive security plan, the following must be provided:

a) Confidentiality:

Information cannot be observed by an unauthorized party. This is accomplished through public key and symmetric key encryption.

b) Data security:

Transmitted data within a given communication session cannot be altered in transit due to error or an unauthorized party. This is accomplished through the use of hash function and message authentication codes(MACs)

c) Message authentication:

Parties within the given communication session must provide certified proof validating the authenticity of a message. This is accomplished through the use of digital signatures. The only communicating party that can generate a digital signature that will successfully verify as belonging to the originator of the message is the originator of the message. This process validates the authenticity of the message (it shows if the acclaimed originator of the message is really the actual originator of the said message)

d) Non repudiation:

In this case neither the sender nor the receiver of the message may deny transmission. This is accomplished through Digital Signatures and third party notary services.

e) Entity authentication:

Establishing the identity of an entity such as person or device.

f) Access control:

Controlling access to data and resources is determined base on the privilege assigned to the data and resources as well as the privilege of the entity attempting to access the data and resources. Schneier Bruce (1996)

1.2 Statement Of Problem

Cryptography is all about securing information from a third party and also validating the authenticity of the information. The major problem faced in cryptography is that of key management. This is the numeric value used by an algorithm to change information (encryption) and validate the information (digital signatures) making sure the information is secured and visible only to individuals who have the corresponding key to recover the information and verify the authenticity of the information.

1.3 Objectives Of The Study

The aim of this project is to create a web based implementation of CRYPTOGRAPHY HASH FUNCTION algorithm

The objectives are as follow:

To implement the HASH FUNCTION algorithm
To implement cryptography using SHA5, MD5 and MD45 algorithm.
To make comparism of SHA5, MD5 and MD45
To create a user friendly application.

1.4 Scope And Limitation

The scope of this study is an examination and implementation of HASH FUNCTION algorithm as a public-key cryptography method with digital signature as authentication for a safe communication on text files only. Other encryption algorithms and authentications are not considered.

1.5 Definition Of Terms

Plaintext Or Clear Text:

The original message that can be read or understood without any special measures.

Cipher Text:

or the encrypted message algorithm. The method of disguising the plaintext in such a way as to hide its substance is encryption.

Encryption:

Is the method of disguising the plaintext in such a way as to hide its substance is encryption

Decryption:

Is the process of getting the original message back is called decryption. To encipher is to transform data into an unreadable format. To decipher is to transfer data into a readable format

Cryptology:

Is the study of cryptography and cryptanalysis.

Cryptography:

is the science of securing data,

Cryptanalysis:

Is the practice of analyzing and breaking secure communication without a key. A key is the secret sequence of bits and instructions that governs the act of encryption and decryption.

Cryptographic Algorithm:

Is a set of mathematical rules used in encryption and decryption. An application (either a hardware component or programmed code) that provides encryption and decryption is a cryptosystem.

Cryptosystem:

Is the strength of cryptography is determined by the length of the key which is in bits. In order words, plaintext is simply binary data (bits).

…

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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TABLE OF CONTENTS
PRELIMINARY PAGES

Title page
Approval page
Dedication
Acknowledgement
Table of Contents
Abstract
CHAPTER ONE
INTRODUCTION
1.1 Background …
⋮
CHAPTER TWO
LITERATURE REVIEW
2.1 Introduction
2.2 Conceptual Review
2.3 Theoretical Framework
⋮
2.4 Empirical Studies
2.5 Research Gaps
2.6 Summary of Literature Review
CHAPTER THREE
RESEARCH METHODOLOGY
3.1 Introduction
3.2 Research Design
3.3 Population of Study
3.4 Sampling and Sampling Technique
3.5 Validation of Research Instrument
3.6 Method of Data Collection
3.7 Method of Data Analysis
3.8 Questionnaire Administration
3.9 Ethical Consideration
3.10 Statistical Analysis
CHAPTER FOUR
DATA ANALYSIS, RESULT AND DISCUSSION
4.1 Introduction
4.2 Presentation and Analysis of Data
4.3 Re-statement of Research Questions
4.4 Test of Hypotheses
4.5 Discussion of Findings
CHAPTER FIVE
SUMMARY, CONCLUSION AND RECOMMENDATION
5.1 Introduction
5.2 Summary of Findings
5.3 Conclusion
5.4 Recommendation
5.5 Suggestion for Further Study
REFERENCES
APPENDIX A - “QUESTIONNAIRE”

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