An image cryptosystem based on general cat map
MA Zai-guang · Journal of China Institute of Communications · 2003
In this paper we first extend the cat map to 揼eneral cat map? then, taking the pixel抯 location and gray level as the initial condition, and the parameters and iteration number as the keys, we apply the general cat map to encrypt the image. Our system contains permutation, substitution and diffusion, which are necessary factors for a good cryptosystem. It is resistive to known plain-text type of attack and chosen plain-text type of attack. It抯 advantages include variable key length and variable image (data block) size, very huge key set, cipher-text with the same size as plain-text, both fast encryption and decryption process.