Integration of chaotic map and confusion technique for color medical image encryption

In order to achieve secure access to color medical image, a symmetric color medical image encryption is proposed in this paper. The proposed algorithm is base on combination of scrambling and confusion processes. 2D lower triangular map used for scrambling the addresses of image pixels, and the proposed propeller algorithm is used to confuse the gray values of image pixels. A number of security analyses conducted to evaluate the proposed algorithm including key space analysis, statistical analysis and lossless analysis. The experimental results indicate that the proposed algorithm robust against brute-force attack and statistical attack. Finally the proposed algorithm is lossless algorithm.