Enhancing the security of caesar cipher substitution method using a randomized approach for more secure communication

TL;DR

This paper introduces a modified Caesar cipher that incorporates affine, transposition, and randomized substitution techniques, expanding character support and using complex key generation to significantly enhance encryption security.

Contribution

It presents a novel, more secure version of the classical Caesar cipher by integrating multiple cryptographic techniques and expanding character support, addressing previous limitations.

Findings

Enhanced security against cryptanalysis

Supports all ASCII and extended ASCII characters

Uses complex key generation for better security

Abstract

Caesar cipher is an ancient, elementary method of encrypting plain text message to protect it from adversaries. However, with the advent of powerful computers there is a need for increasing the complexity of such algorithms. In this paper, we contribute in the area of classical cryptography by providing a modified approach and expanded version for Caesar cipher using knowledge of mathematics and computer science. To increase the strength of this classical encryption technique we use the concepts of affine ciphers, transposition ciphers and randomized substitution techniques to create a cipher text which is nearly impossible to decode. We also increase the domain of characters which Caesar cipher Algorithm can encrypt by including all ASCII and extended ASCII characters in addition to alphabets. A complex key generation technique which generates two keys from a single key is used to provide enhanced security. We aim to propose a modified version of Caesar cipher substitution technique which can overcome all the limitations faced by classical Caesar Cipher.