Symmetric Multiple Image Encryption Using Multiple New One-Dimensional Chaotic Functions and Two-Dimensional Cat Man

The paper presents a symmetric approach to encrypt multiple images with aid of newer chaotic functions which help in producing larger chaotic range and Arnold cat map. The encryption process comprises of two-phase: permutation and diffusion. The bit-level permutation is performed using expand and shrink strategy and for pixel shuffling the Arnold cat map is employed. In diffusion phase, the intensity of image pixel is modified. Firstly, using the expansion process images are partitioned into their even and odd bit-planes. Then, a bigger image is formed by the amalgamation of partitioned plane-bits. Secondly, the permutation phase is employed with help of chaotic function. Arnold cat map and newer chaotic function logistic-sine and logistic-tent map generates the sequence of random numbers. Finally, in diffusion phase, tent-sine map is used to modify the intensity value of the image pixel and the shrink process produced the encrypted images. Initial values of chaotic functions are used for encryption as well as for decryption of images. The performance measures are computed to show the efficiency and attack resistance capacity of encryption technique.