A Dual Security Approach for Medical Images using Encryption and Watermarking Optimized by Differential Evolution Algorithm
Venu Gopal Reddy · 2015
Cryptography and watermarking combination appears as a good promising tool in regard to medical image security and management. In this paper a dual security approach of watermarking and encryption is proposed along with a Multi-objective function for medical image watermarking to ensure that the watermark maintains its structural integrity along with robustness and imperceptibility. Differential Evolution (DE) optimization is employed to optimize the objective function to choose a correct type of wavelet and scaling factor. The water marking is proposed to be implemented using both Discrete Wavelet Transforms (DWT) and Singular Value Decomposition (SVD) technique. The encryption is done using RSA and AES encryption algorithms. A Graphical User Interface (GUI) which enables the user to have ease of operation in loading the image, watermark it, encrypt it and also retrieve the original image whenever necessary is also designed and presented in this paper. The robustness and the integrity of the watermark is tested by measuring different performance parameters and subjecting it to various attacks. The performance of the optimization is compared with the optimsation results of Genetic Algorithm (GA).