Enhanced Image Encryption using Chaotic Substitution, DNA Encoding, and Random Permutation

Abstract: With the increasing challenges of securing multimedia transmission over the internet, image encryption has emerged as a critical research area. This paper presents a novel image encryption scheme that integrates chaotic substitution, DNA encoding, and random permutation techniques to enhance security. The proposed method exploits the unpredictability of chaotic sequences, the computational benefits of DNA encoding, and the randomness of permutation to strengthen encryption.In this approach, pixel values are initially converted into DNA sequences using a predefined encoding scheme. A high-dimensional Lorenz chaotic map generates chaotic sequences, which are then employed for pixel substitution, effectively scrambling the DNA-encoded pixel values. Furthermore, a random permutation technique known as the Fisher-Yates shuffle is applied to further disrupt the substituted pixel values, increasing the overall complexity of the encryption process.By integrating these techniques, the proposed scheme achieves robust security, making it resistant to various cryptographic attacks. Experimental results validate the effectiveness of this approach, demonstrating high encryption strength while maintaining computational efficiency