Abstract
Applying security to the transmitted medical images is important to protect the privacy of patients. Secure transmission requires cryptography, and watermarking to achieve confidentiality, and data integrity. Improving cryptography part needs to use an encryption algorithm that stands for a long time against different attacks. The proposed method is based on number theory and uses Chinese remainder theorem as a backbone. This approach achieves high level of security and stands against different attacks for a long time. On watermarking part, the medical image is divided into two regions: a region of interest (ROI) and a region of background (ROB). The pixel values of the ROI contain the important information so this region must not experience any change. The proposed watermarking technique is based on dividing the medical image in to blocks and inserting the watermark to the ROI by shifting the blocks. Then, an equivalent number of blocks in the ROB are removed. This approach can be considered as lossless since it does not affect on the ROI, also it does not increase the image size. In addition, it can stand against some watermarking attacks such cropping, and noise.
Highlights
Until recently the sole responsibility of keeping patients’ records in confidence was with the Physicians
Security and usability: medical images may stored for a long time; the encryption algorithm should result in a ciphertext that can stand against different attacks
Watermarking is the process of embedding small sensitive data such as copyright and ownership identification in images; it has become a necessary component of multimedia applications that are subject to illegal use [23]
Summary
Until recently the sole responsibility of keeping patients’ records in confidence was with the Physicians. With the advent of recent computer technology, and it’s permeation into the Medical field through E-health [2], Telemedicine [3,4,5,6], to name but a few, the challenges of confidentiality arising from the storage and transmission of medical data cannot be left to physicians alone. Confidentiality means that only the entitled users have access to the information and this can be achieved using encryption. The watermarking method must be reversible, in that the original pixel values must be exactly recovered. Applying watermarking blindly is not acceptable in the medical imaging field where any modification in the high information area of the image is not acceptable. The conclusions and the future work are presented in last section
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