Image encryption algorithm using chaotic maps and cellular automata

Abstract

Nowadays, some encryption schemes are not sensitive enough to plain-image, which leads to poor robustness and the scheme is vulnerability to attacks. By employing chaotic maps and cellular automata (CA), a novel image encryption algorithm is presented in this work to increase the sensitivity to plain-image and improve the security. Firstly, initial values of the two-dimensional Logistic-Sine-coupling map (2D-LSCM) and the Logistic-Sine-Cosine map (LSC) are calculated by the SHA-256 hash value of original image, and the process of diffusion is conducted next. Secondly, the key matrices are produced by iterating chaotic map in the process of permutation. The diffused image is scrambled by the index matrices, which are produced by sorting every row or column of the key matrices. Finally, the previous scrambled image is transformed into cipher-image by using CA. The experimental results and theoretical analysis prove that the proposed scheme owns good security as it can effectively resist a variety of attacks.

Image encryption based on combined between linear feedback shift registers and 3D chaotic maps

“…In the begging, the inputting color image is divided into two equal parts (upper UP and lower LW) with size Sk. Second, using LFSRs that comprise three registers with different lengths (29,31,33) and different taps (2,7,13), (1,2,3), (11,13,22), respectively, key K is generated that contains non-repetitive random numbers with size Sk. The same key is used to redistribute the locations of the pixels in each part.…”

“…We isolate the image colors that result from the previous stage to the three basic components red, green, and blue (RGB) in the first step. The 3D chaotic maps in (1), (2), and (3) generate three keys (Kr, Kg, Kb), each used to encrypt a specific color. Image data encryption is performed by applying an XOR process between the data of each color, with the key corresponding to where the value of each point is changed in the second step.…”

“…With the great and rapid technological development in various fields, including computers and data transfer, images are exposed to many risks and security threats, especially when transmitted through unsecured channels over the internet [1], [2]. Particularly in times of war, the confidentiality and security of transmitted information play an essential role in success [3].…”

“…Particularly in times of war, the confidentiality and security of transmitted information play an essential role in success [3]. Encrypting is an effective way to protect an image's data before sending it to the receiver [2], [4]. The main purpose of the image encryption process is to transform it into another form so that no one can know its content without owning the original key [5].…”