Image Encryption Scheme of Pixel Bit Based on Combination of Chaotic Systems

Recently, a number of chaos-based image encryption algorithms have been proposed. However, the initial parameters used in masking operation are usually fixed in the whole encryption process. In this paper, we introduce an efficient image encryption scheme of pixel bit based on combination of chaotic systems with variable initial parameters. The algorithm takes advantage of the best features of chaotic maps combined with the pixel value bits. The initial parameters and the key stream employed in the encryption process are generated from two chaotic maps. Simulation result and analysis both confirm that the new algorithm possesses high security with less computation for practical image encryption.