A novel cryptosystem based on DNA cryptography, hyperchaotic systems and a randomly generated Moore machine for cyber physical systems

Abstract

Nowadays, a large amount of data is transmitted over the Internet and in Cyber–Physical Systems (CPS). A significant portion of this data is highly confidential. Bank account details, credit card details, One Time Passwords (OTP), financial data and other sensitive information are some examples of highly confidential data. A secure encryption and decryption technique is needed to ensure the secure transmission of data. These techniques use a secret key and guarantee that confidential data is only accessible to authorized individuals. This paper proposes a novel encryption process based on Deoxyribonucleic Acid (DNA) cryptography, a hyperchaotic system and a Moore machine. The hyperchaotic system generates four pseudo-random number sequences used in DNA-based operations. The Moore machine performs substitutions in the DNA sequence that makes the system more secure. The proposed technique can protect a system from various attacks, namely man-in-the-middle attacks, ciphertext-only attacks, known-plaintext attacks, brute force attacks and differential cryptanalysis attacks. The proposed scheme gives an average avalanche effect of 54.75%, which guarantees a high level of robustness. Moreover, experimental results show that the proposed scheme is more secure and efficient than the existing schemes.