Color image encryption and authentication using dynamic DNA encoding and hyper chaotic system

• A hyperchaotic system is used to shuffle image at block-level and bit-level. • Row-level dynamic and random DNA encoding of every color plane of image. • Hardness of Elliptic curve discrete logarithmic problem. • A novel digital signature, Mutual authentication and key exchange scheme. • Low computational complexity and robustness to various types of security attacks. This paper takes a holistic approach to propose a comprehensive framework for color image encryption with some novel features. The framework is designed around a secure encryption and decryption scheme leveraging dynamic DNA encoding, hyperchaotic system and elliptic curve cryptography. The novel features being mutually authenticated key generation and exchange based on split share and digital signature for image authentication. A color image is encoded into a DNA sequence using randomly selected row-level encoding rules. A novel 4D-Hyperchaotic system is used to generate pseudo-random sequences to permutate image information at bit-level and block-level. The multidimensional Hyperchaotic system increases non-periodicity, ergodicity, and unpredictability than a simple chaotic system. An elliptic curve-based substitution system is employed to achieve computationally efficient encryption and authentication. Different subkeys have been employed to increase the key space and embed confusion and diffusion into the proposed scheme. Results and analysis show that the proposed framework is computationally efficient and robust to different types of attacks and cryptanalysis carried over the images