A New Method for Encryption of Color Images based on Combination of Chaotic Systems

This paper presents a new method for encryption of color images based on a combination of chaotic systems, which make the image encryption more efficient and robust. The proposed algorithm generates three series of data ranged between 0 and 255 using a chaotic Chen system. Another Chen system is then started with different initial values, which are converted to three series of numbers from 0 to 10. The red, green, and blue values are combined with the three values for the first Chen system to encrypt pixel 1 of the image, while the values for the second Chen system are used to distort the combination order of the values for the first Chen system with the pixels of the image. The process is repeated until all pixels of the image are encrypted. The innovative aspect of this method is in combination with the two chaotic systems, which make the encryption process more complicated. The tests performed on the standard images (USC datasets) indicate the effectiveness and robustness of the proposed encryption method.