Block Image Encryption Algorithm Based on Novel Chaos and DNA Encoding

To solve the problem of low secret space and security some image schemes, a novel 4D chaotic system is derived in this paper. Compared with other similar systems, new only has one equilibrium point can exhibit hyperchaotic characteristics, under parameter space. The better dynamic characters represented by calculation Lyapunov exponents, phase planes, visual 0–1 test diagram. In study, encryption algorithm employed based on system, Zigzag transform, DNA operation. Based improved transformation, plain block-scrambled, encoded treated sequences. transformation efficiency combining multiple images at same time. Numerical analysis been carried out; results show that our achieves much performance security, i.e., enhanced pseudo-randomness, higher key sensitivity, weak correlation, fairly large space, stronger ability to resist various attacks. Through analysis, deemed safe effective for digital images.