Dual Watermarking in Tele-radiology using DWT for Data Authentication and Security

Technological development in the field of digital enhancement and computer access has echoed rapid change in simplifying medical imaging and maintaining hospital information system (HIS), including radiology information system (RIS). Digital watermarking is a promising technique which hides the information like images, video or audio on a digital support to provide authentication control, copyright protection, integrity verification of the owner. At earlier stage, cryptography, digital watermarking and steganography methods were used to secure the data transmission over Internet. Tele-radiology is one of the successful medical health services. Although it enabled effective practice of medical service, it has several security issues. In this paper, we intend to develop a novel and proficient implementation of an image watermarking system based on Discrete Wavelet Transform (DWT) for medical data. The approach includes Least Significant Bit (LSB) substitution for finger print encryption and LSB along with block cipher algorithm for medical data encryption. Verification of fingerprint eludes legal disputes like fake users, misuse of data, image retention etc. Compared to the conventional SVD-based watermarking method experimental results of the proposed method based on DWT validate secured transmission for multiple documents of medical data by providing privacy, integrity and authenticity. The proposed method shows better PSNR value and is robust. The proposed strategy is achieved using MATLAB software tool.