Abstract: Proposed a new hyperchaotic system, analyzed the new system, the phase diagram of the chaptic attractor, and the nature of the ectuilibrium point, Lyapunov exponent, nonlinear dynamics properties and so on, proposed a novel image encryption scheme based on a four dimensional hyperchaotic system .The experimental results and security analysis show that the new scheme has stronger resistance for the exhaustion attack, count attack and known-plaintext attack,and it is of high security.

Key words: Hyperschaotic system, Chaotic sequences, Lyapunov exponent, Image encryption