Image encryption based on composite chaotic system

This paper proposes an image encryption system based on composite chaotic system. A three dimensional Chen's system which has a complex dynamical behavior and a one dimensional logistic chaotic mapping are employed in the encryption system. The output sequences of these two chaotic systems are composed by using a special method, and a fast image encryption is realized by means of the bit-wise x or operations. The results of simulation experiments and security analyses indicate that this encryption system not only has a large key space but also has a very sensitivity with respect to the secret key and the original image. The encryption system proposed in this paper possesses perfect diffusion and confusion properties and it can resist the know-plaintext attacks and chosen-plaintext attacks.