Authors - Michael David, Chekwas Ifeanyi Chikezie, Abra-ham Usman Usman, Sulieman Zubair, Henry Ohiani Ohize, Joseph Ojeniyi Abstract - With the rapid growth of digital communication and multimedia applications, secure transmission and storage of digital images have become critical challenges. Conventional text-based encryption algorithms are often inadequate for image data due to its high redundancy, strong pixel correlation, and large data volume. These characteristics necessitate specialized encryption mechanisms that can provide strong security while maintaining computational efficiency. This paper proposes a robust image encryption framework designed to ensure confidentiality, resistance to cryptographic attacks, and suitability for real-time applications. The proposed approach integrates advanced permutation–diffusion operations with chaos-based key generation to effectively disrupt statistical characteristics inherent in digital images. Chaotic maps with high sensitivity to initial conditions are employed to generate dynamic encryption keys, enhancing key space complexity and resistance against bruteforce and differential attacks. Pixel-level scrambling is combined with nonlinear diffusion operations to eliminate spatial correlations and achieve uniform cipher text distribution. The encryption process is further optimized to support grayscale and color images while preserving computational feasibility. Extensive experimental evaluation is conducted using standard benchmark images to assess security and performance. Statistical analyses, including histogram uniformity, correlation coefficients, information entropy, NPCR, and UACI metrics, demonstrate strong resistance against statistical and differential attacks. Key sensitivity and key space analysis confirm robustness against bruteforce attempts. Performance results indicate that the proposed scheme achieves a favorable balance between security strength and execution efficiency, making it suitable for real-time image protection. The experimental findings validate that the proposed image encryption framework provides enhanced security, scalability, and practicality, offering an effective solution for secure image communication in modern digital environments.
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