Development of an Improved Playfair Cryptosystem Using Rhotrix

Description

– Development of an Improved Playfair Cryptosystem Using Rhotrix –

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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.

Introduction

The security of data transmission is an important problem in communication networks. A communication system is reliable as long as it maintains the integrity, availability, and privacy of data. Data integrity is the protection of data from unauthorized modification, resistance to penetration, and undetected modification.

Therefore, it is important to secure a cryptosystem that provides encryption and decryption to the data. To achieve a secure cryptosystem, Cryptology is essential. Cryptology is the study of cryptography and crypt analysis. Cryptography is the study of information hiding and verification.

It includes the protocols, algorithms and strategies to securely and consistently prevent or delay unauthorized access to sensitive information and enable verifiability of every component in a communication (Saini and Mandal, 2015).

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