Abstract. To overcome low security in the low-dimensional chaotic system, a new 4D chaotic system based image encryption is presented in this paper. Only the diffusion function is considered in the proposed algorithm. Besides of the parameters in 4D chaotic system, we also add three control parameters to enlarge the key space. Here, the designed control parameters are dependent on the plain-image. With three rounds of iteration, the experimental results show that the new algorithm can have fast performance, good efficiency and high security. It is suitable for us to make real-time communication and transformation over the internet.

Received: September 19, 2012

AMS Subject Classification: 40C05, 68U10, 68P25, 94A60

Key Words and Phrases: image encryption, 4D chaotic system, diffusion, security analysis, modular function

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