Secure Image Transmission Using a Hybrid Scheme of JPD, Rubik’s Cube Encryption, and DWT-SVD Watermarking

This paper presents a robust and efficient crypto-watermarking framework for secure transmission of color images, combining advanced encryption and watermarking techniques. The proposed system integrates wavelet fusion, multi-level discrete wavelet transform (DWT), singular value decomposition (SVD), joint permutation and diffusion (JPD), and Rubik’s Cube encryption. Initially, a color watermark image is encrypted using JPD and decomposed into its RGB components, while grayscale watermark images undergo Rubik’s Cube-based encryption for added security. Each encrypted component is fused with its corresponding encrypted watermark and embedded into the host image's RGB channels using multi-level DWT-SVD. The final watermarked image is constructed by combining the individually watermarked color channels. Experimental results confirm the system's resilience against common and advanced attacks, including rotation, Gaussian noise, and histogram equalization. Even under such adversarial conditions, the system reliably extracts and reconstructs the watermark, demonstrating its effectiveness in preserving image confidentiality and integrity during transmission. This hybrid approach offers a promising solution for secure multimedia communication in hostile environments.