An Efficient 2bits-Level for Image Encryption Based on Dna, Multi-Delayed Chebyshev Map and Cellular Automata

Abstract

This paper proposes an encryption scheme based on cellular automaton image and multi-delay chebyshev map. The scheme of the image to binary DNA encoding, the use of multi-delay chebyshev map to generate pseudo random sequences. The addition of the two column of the sequence's sorting index selects the addition of the DNA rule to assign the result to one of the columns, and the other column's diffusion operation is an exclusive or operation of the value of the random DNA code generated by the cellular automata, and then assigns the value to the column. The row operation is the same as the column operation. After such operation, the pixels in the original image are changed, so that the image is encrypted. The algorithm is simulated by MATLAB, which shows that the encryption effect is good, and the encrypted image is similar to the noisy image. Through analyzing the security index of encrypted image, we know that the image encrypted by the algorithm is highly secure.