Combining watermarking and encryption algorithm for medical image safe transfer: method based on DCT

摘要

A novel method for watermarking and encryption of medical image based on the DCT is presented. Medical data, such as the patients' private information is embedded into the corresponding medical image. After that, the watermarked medical images are encrypted by using the AES and the RSA encryption Algorithm to increase the robustness. Our method uses the standard JPEG compression for the embedding of patients' private data. The insertion block is inserted just after the DCT phase. To control identification and eventually the correction of the watermark, it should be noted that we used the serial turbo code to recover the data inserted. The proposed system is tested against several attacks, such as compression, noises, filtering and geometric transformation. Experiments and analyses show that low distortion and high robustness have been achieved in the process of watermarking, and, at the same time, elevated security has been acquired in the encryption phase.