Enhancing the security of caesar cipher substitution method using a randomized approach for more secure communication
This work addresses the need for more secure classical cryptography methods for communication, but it is incremental as it builds on existing techniques.
The paper tackles the security limitations of the classical Caesar cipher by proposing a modified version that incorporates affine ciphers, transposition ciphers, randomized substitution, and extended character domains, resulting in a cipher text claimed to be nearly impossible to decode.
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.