Publication

Abstract : The rapid growth of digital communication has made the need for secure image transfer even greater to stop unauthorized access. Traditional AES-based image encryption relies on a fixed substitution box (S-box), which limits randomization and makes it easier for cryptanalysts to attack. This study alleviates these limitations by creating a dynamic S-box that employs state variables from the Lorenz chaotic system and integrates it into the AES algorithm. The chaotic traits make things less predictable and make them more resistant to differential and statistical attacks. Experimental validation on diverse standard test images demonstrates improved performance in terms of entropy, NPCR, UACI, and SSIM compared to conventional AES. The proposed method shows better resistance to image processing distortions while still being very sensitive to keys and hard to crack with brute-force attacks.