A new image encryption algorithm based on hyperchaotic mapping

An improved image encryption method, which is based on hyperchaotic sequence, is proposed. Firstly, chaotic sequences based on Rössler hyperchaotic system are generated, and the image is pro-encrypted by replacing pixels in the image with generated sequences; then horizontal rows and vertical rows in the pro-encrypted image are further scrambled with Logistic mapping, in order to improve the security. The effect of encryption and the security are also analyzed with evaluating indicators. Simulation results indicate that the proposed method is more efficient and security performance is higher.