TY  - EJOU
AU  - Samiullah, Muhammad 
AU  - Aslam, Waqar 
AU  - Sadiq, Saima 
AU  - Mehmood, Arif 
AU  - Choi, Gyu Sang 

TI  - Hyperchaos and MD5 Based Efficient Color Image Cipher
T2  - Computers, Materials \& Continua

PY  - 2022
VL  - 72
IS  - 1
SN  - 1546-2226

AB  - While designing and developing encryption algorithms for text and images, the main focus has remained on security. This has led to insufficient attention on the improvement of encryption efficiency, enhancement of hyperchaotic sequence randomness, and dynamic DNA-based S-box. In this regard, a new symmetric block cipher scheme has been proposed. It uses dynamic DNA-based S-box connected with MD5 and a hyperchaotic system to produce confusion and diffusion for encrypting color images. Our proposed scheme supports various size color images. It generates three DNA based S-boxes for substitution namely DNA_1_s-box, DNA_2_s-box and DNA_3_s-box, each of size . Next, the 4D hyperchaotic system followed by MD5 is employed in a novel way to enhance security. The three DNA-based S-boxes are generated from real DNA sequences taken from National Center for Biotechnology Information (NCBI) databases and are dependent on the mean intensity value of an input image, thus effectively introducing content-based confusion. Finally, Conservative Site-Specific Recombination (CSSR) is applied on the output DNA received from DNA based S-boxes. The experimental results indicate that the proposed encryption scheme is more secure, robust, and computationally efficient than some of the recently published similar works. Being computational efficient, our proposed scheme is feasible on many emergent resource-constrained platforms.
KW  - Block cipher; substitution; permutation; diffusion; confusion

DO  - 10.32604/cmc.2022.021019