DEVELOPMENT OF AN IMPROVED PLAYFAIR CRYPTOSYSTEM USING RHOTRIX

ABSTRACT

 

Playfair is one of the best-known traditional ciphers but it is limited to different aspects such as: white space, numbers and other printable characters. The existing technique is based on the use of a 5 × 5 matrix. This algorithm can only allow the text that contains uppercase alphabets only. But many algorithms have been proposed which allow extension of playfair to: 6 × 6 matrix, 8 × 8 matrix and 7 × 4 matrix. This dissertation deals with some of the limitations such as lowercase, numbers, white space and repetition of alphabet in pairs. Proposed modification uses rhotrix which is a new paradigm of matrix theory for rectangular arrays. This work proposes an improved key matrix formation of the playfair cipher. The order of the rhotrix will be set to 6 to make it compatible with the [n×(n-1)] mode of rhotrix representation which supports all 26 alphabets in both upper case letters (A-Z) as well as lower case letters (a-z), ten digits (0-9), special characters and the extended special characters. Experimental result produced better playfair cipher to incorporate randomness and to eliminate the chances of being attacked by frequency testing of character occurrence over an existing 11 × 11 matrix. The system was developed in java because of platform independence and availability.

 

 

 

Download Full Material-N5000

Related Post

Design a computer based scrabble game

CHAPTER ONE/INTRODUCTION

1.1 Background of the Project

Scrabble is an old classic board game, with game rules that are not very complicated. Compared to other classic board games, such as Chess, there are more factors to take into consideration when making a move in Scrabble. Apart from anagramming and generating words, there are other crucial decisions to make. A player would probably find several legal moves in one round, and then would have to decide which one to place. Choosing the move that generates the highest score is not always the ideal way to go. It could be that making such a move would create a situation in the next round where nothing could be done, or let the opponent score highly.

Making the choice of which move to use include many factors, and there are several different techniques and strategies one can follow to make the decision easier. Hitting the bonus squares can generate an extremely high score, hence one strategy is to try to always hit the bonus squares and prevent the opponent from doing the same. Another way of being successful is to prioritize using letters with high score, since they would not only generate a high total score to the player, but could also create difficult situations in the future if not used as soon as possible.

Scrabble game is a simple game played by four, three, two even one person. Scrabble game is also played with tiles and encountered on a

special and well-designed board. The game can be played with a board disserted with a cross-like path. In between any of the two arms of the

cross path is a center square calved out as a square box, which has a

symbol of star.

 

At the down side of this board, there is a device called a Rack where the tiles are been placed before they are picked. This rack can be any colour depending on the developer or the user, titles and the rack can have the same colour. This rack is occupied by seven tiles at a starting and can be change or shuffle when the need arises. Each player has a starting point (middle) where he/she will place the tiles when picked. This spot is of different colour as the box (others) and is called the starting point. Other features of the board include smaller square boxes that make up the steps on the path which each tile steps on as it enters the path to produce a word. There are double and tripple word squares on the board. In the double word lines or square if two tiles that will generate a meaning are placed there, the player will score a high mark likewise the tripple word square. There are tiles, which are used to call for placement, which determine how the score is been ranked on the score device. Some makes use of the standard set number, while some make use of only seven (7) depending on the players.

When the game is being played, the objective of each player is to navigate his tile on the path to achieve a meaningful word. And any player whose tiles finished first wins the games or any player that scores the highest point wins the game i.e. top score or best player. But in other hand, the player whose tiles remain after number-of- players have finish, come last and become the worst looser. Each player must abide by therules and regulation of the game that will be specified in subsequent chapters.

1.2 Statement of the Problem

Because scrabble game is played manually, young people do not have much interest in it. But making it computer based will make young people to enjoy it.

1.3 Objective of the Project

The objective of this study is stated as following:

To make scrabble game join the most other games in computer “world”

To handle cheating in scrabble game and to standardize the game.

To simulate scrabble game using computer.

1.4 Project justification

This project is justified because making scrabble computer based enhances learning.

1.5 Scope of the Project

The scope of this project is to design a computer based scrabble game.

3

1.6 Project Report Organization

This project is organized into six chapters. Chapter one is the

Introduction, chapter two is the Literature Review, chapter three is the

Methodology and System Analysis, chapter four is the System Design,

chapter five is the System Implementation and Testing and chapter six is

the Summary, Conclusion and Recommendation.

Download Full Material-N5000

Automated Result Mailing System

Automated Result Mailing System

Mail is a system for physically transporting documents and other small packages. Automated mailing system is to provide a communication system in an organization, which takes the chance of establishing a channel for sending and receiving information between the users. The aim of this project is to provide a means of sending mail in computer science department. The present system faces some challenges which are lecturers do come to HOD’s office to receive mail or information which is a convenience to both the staff and the HOD in the department. This prompt the development of the new system that will replace the existing one by solving all problems associated with the manual system. Structured System Analysis and design method is the methodology used in designing this project. The system will be programmed using PHP and MySQL as the database. An implementation of this project will not only create a convenience system but also manage mail and information in the department..

4K

Download Full Material-N5000

Design and implementation of eLearning platform for distance learning in Lagos state

ABSTRACT

This project is to design a Web-based distance learning system, where instructors and students can participate fully in distance learning activities while geographically separated from each other. This project is aimed to design and implement a distance learning system and use internet as the delivery mode.  This report discusses in detail background research on distance education and different modes of delivery technologies used. It also discusses advantages and disadvantages of distance learning. It also gives tips for successful distance learning and who should opt distance learning, as it is not suited for everyone. This project presents the design and implementation of this new and inexpensive distance learning system. It was developed using HTML, CSS and PHP. It handles three different kinds of users: student, instructor and admin.

Download Full Material-N5000