Enhanced Image Encryption Scheme Using DNA Encoding and Binarized Chaotic Cores for Robust Cryptographic Security
Laxmaiah Kocharla, K. B.S.D. Sarma, Tejaswi Vallabhapurapu, P. Udaya Bhanu, Naveen Kumar Penjarla · 2024
One-dimensional (1D) chaotic maps, despite their simplicity and suitability for cost-effective hardware implementation, face limitations due to a small number of control parameters and periodicity under finite precision, reducing their effectiveness in encryption systems. This study addresses the challenge of limited periodicity in 1D maps when represented with fixed-point precision. It introduces an image encryption scheme that incorporates DNA encoding and two uniquely configured binarized chaotic cores. These chaotic cores are designed to generate pseudorandom numbers with strong cryptographic properties, essential for the confusion and diffusion processes in image encryption. By converting both the chaotic sequence and the image into DNA sequences according to predefined encoding rules, the DNA encoding provides an additional security layer. Security analyses confirm that the proposed scheme is highly resistant to common attacks and demonstrates strong encryption performance, provided that all computations are carried out using binary integer arithmetic.