A robust DHWT based AES encrypted image watermarking scheme

In this paper, we propose the blind watermarking algorithm based on Double Haar Wavelet Transform (DHWT) for copyright protection of encrypted images. Watermark embedding is performed in wavelet transform domain. DHWT is applied to the original cover image and binary watermark. Selected subband is encrypted by Advanced Encryption Standard (AES) encryption scheme. Singular Value Decomposition (SVD) is applied on selected subband of both the cover image and binary watermark. Eigen values of selected subband of cover image are modified by the Eigen values of the selected subband of binary watermark. Experimental results show that the proposed algorithm achieves very high imperceptibility which is evidenced by high Peak Signal to Noise Ratio (PSNR) value for various gray scale encrypted images. Also, it produces very high robustness against various types of image processing attacks.