Blind Watermarking/Encryption Schema for Security Medical Image Applying DWT-SVD-AES-Chaos Combination

This paper proposes an effective and imperceptible method to protect medical images using watermarking and encryption. The approach combines DWT, SVD, AES and a serial Turbo code. The method employs a second-level DWT decomposition on the cover image and specifically chooses the LH2 and HL2 sub-bands for watermark embedding. These sub-bands are further divided into 8x8 sub-blocks, which undergo SVD transformation. The watermark is subsequently embedded into the singular values of the chosen DWT sub-bands. This approach effectively utilizes transform domain techniques, the proposed method provides a more reliable and robust solution. Moreover, the modified AES encryption is included, which has two advantages: it conceals the watermarked material and strengthens overall security. The proposed technique has shown to be highly effective, with significant PSNR (45.9001 dB), WPSNR (50.8099 dB) and NC values very close to 1 even in the presence of major attacks.