Abstract

The paper implements and optimizes the performance of a currently proposed chaos-deoxyribonucleic acid -based hybrid approach to encrypt images using a bi-objective genetic algorithm optimization. Image encryption is a multi-objective problem. Optimizing the same using one fitness function may not be a good choice, as it can result in different outcomes concerning other fitness functions. The proposed work initially encrypts the given image using chaotic function and DNA masks. Further, GA uses two fitness functions – entropy with correlation coefficient, entropy with unified average changing intensity, and entropy with number of pixel change rate – simultaneously to optimize the encrypted data in the second stage. The bi-objective optimization using entropy with CC shows significant performance gain over the single-objective GA optimization for image encryption.