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  ABSTRACT

 The use of manual system of data encryption and decryption has a damaging implication resultant on the images in some companies and the negative impact this trend has had on the users of such system. Much resource is lost annually by firms due to the uncontrolled and unscientific nature of this system.

In this traditional system, to guarantee privacy of information / communications between any two subscribes in a network consisting of 1000 members, 499,500 secret keys would be necessary, one for each possible combination of sender and receivers. Keys have been distributed by a secure channel such as a trusted courier with an attached case manual led to a wrist, a costly and time consuming method.

This particular project is set to appraise already existing system by designing a better one which will facilitate the level of satisfaction and competence in the challenges in information technology.  

 

ORGANISATION OF WORK

      This project work titled design and implementation of computerized data encryption and decryption system is organized into different chapters.

        Chapter one introduces the project work, purpose of the study, aims and objectives. The limitations, scope of work and assumptions were also included. This section ended with a definition of term used in the project work.

         The review of books and literature of different scholars with respect to the above caption are summarized in chapter two to bring clarification.

          I went forward in chapter three to describe and analyze the already existing system using procedure chart, information flow chart etc.

          The chapter four and five of this work dealt intensively on the design and implementation of the new computerized system using diagrams and programs.

          Documentation of the information the subsequent users of the software is elaborated in chapter six.

          Finally, I have declared a recommendation and conclusion section for anybody who is interested in this work piece as shown in the chapter seven.

LIST OF FIGURE

 

Fig 3.1            Information Flow Diagram

Table 4.1       Output Report

Table 4.2       Input Form

Fig 4.2.1         File Design

Fig 4.2.2         System Flowchart

Fig5.1             Program Flowchart

Fig 5.2            Database Design

 

TABLE OF CONTENT

CHAPTER ONE

1.0 INTRODUCTION…………………………………………………1-3

 1.1 Statement of the Problem…………………………………………3

 1.2 Aims and Objectives……………………………………………….4

  1.3  Purpose of the Study………………………………………..….4-5

   1.4 Significance of Study…………………………………………….5

   1.5 Scope/ Delimitation………………………………………..……5-6

   1.6 Limitations / Constraints…………………………………………6

   1.7 Assumption of Study……………………………………..………6

   1.8 Definition of Terms………………………………………………6-7

CHAPTER TWO

2.0     Review of Literature……………………………………………8

 

CHAPTER THREE

3.0 Description and Analysis of the Existing System……………..15

3.1  Fact Finding Method / Methodology………………………15-16

3.3  Objective of the Existing System…………………………….…17

 3.4 Input, Process and Output Analysis……………………………17

3.4.1 Input Analysis………………………………………………….17-18

3.4.2 Process Analysis………………………………………..…………18

3.4.3 Output Analysis……………………………………….………........18

3.5 Information Flow Diagram……………………………..……………19

3.6 Problems of Existing……………………………………………….19-20

3.7Justification for the New System……………………………………20

     CHAPTER FOUR

4.0 Design of the New System

4.1Design Standard………………………………………………………21

4.2 Output Specification and Design…………………………………..21

4.3 Input Specification and Design……………………………………22

4.3.1FileDesign……………………………………………………….…24

4.4 Procedure Chart …………………………………………………….25

4.5 System Flowchart…………………………………………...……….26

4.6 System Requirement………………………………………………26

4.6.1Hardware Requirement…………………………………………27

4.6.2 Software Requirement………………………………..…………27

4.6.3 Operational Requirement……………………………………….27

4.6.4 Personnel Requirement………………………………………….27

CHAPTER FIVE

5.0 Implementation………………………………………..…………..28

5.1 Design Standard……………………………………………………29

5.2 Program Design……………………………………………………29

5.3Program Flowchart…………………………..…………….………30

5.4 Pseudocode…………………………………….……………..…….32

Coding

Test Data / Test Run

5.5 User Training (An Overview)………………………………..…….33

5.6 Cutover Process………………………………….…………………..33

CHAPTER SIX

6.0 Documentation……………………………………………….……….34

6.1 Program Documentation……………………………………..……….34

6.2 User Documentation…………………………….…………..……..34-35

  CHAPTER SEVEN

7.0 Recommendation, Summary and Conclusion…….………..………36

7.1 Recommendation……………………………………..……….………36

7.2 Summary…………………………………………………….………….36

7.3 Conclusion………………………………………………..…………….37

Reference……………………………………………………..……………..38

 

CHAPTER ONE

1.0                                          INTRODUCTION

  The ongoing dilemma of digital age is balancing convenience against security. Security is a system of safeguards for protecting information technology against disasters, system failure, and unauthorized access that can result in damage or loss. There are several reports of the spammers, crawlers and hackers who break into people’s privacy to gain illegal access to their data.  These have posed greater challenges on people who use database, transact online and internet users.

This project work is design to embark on a security mechanism using computerized data encryption and decryption system to resolve this problem.           

 Data encryption is the process of altering readable data into unreadable form to prevent unauthorized access. Encryption is able to use powerful mathematical concepts to create coded messages that are virtually impossible to break. As one article point out,  it is  easy to encrypt a message on a simple pc so that the biggest computer in the world couldn’t decipher it without spending far more time on the problem that exists in the life span of the entire universe.

 

 

 

There are two basic form of encryption      

Private Key and public key

Private key: Private key (symmetric) encryption means that the same secret key is used by sender and receiver to encrypt and decrypt a message. The encryption system (for “Data Encryption Standard”) was adopted as a federal standard for private key encryption in 1976.

Public key: Public key encryption means that two keys used a public key, which the receiver has made known before hand to the sender who uses it to encrypt message, and a private key, which only the receiver knows and which is required to decrypt the message.

This illustration given below show encryption system using private key/ public key.

PRIVATE KEY

                                 ENCRYPTION                DECRYPTION

                                                   

 

 

 

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