A Zero Watermarking Scheme for Encrypted Medical Images Based on Tetrolet-DCT

Aiming at the problem of medical image leakage in the transmission process, in order to enhance the concealment of patient data, a Tetrolet-DCT based encrypted medical image zero watermarking scheme is proposed. Firstly, DFT and Logistic mapping are used to encrypt the original medical image to obtain the encrypted medical image. Then, Tetrolet-DCT is used to extract the features of the encrypted medical image. After that, zero watermark technology is applied to embed and extract the watermark information of patients. Experimental results show that the proposed scheme ensures the concealment of the original medical image, and can effectively extract the watermark information. It has good robustness both against traditional attacks and geometric attacks.