Abstract
Compared with general chaotic systems, laser chaotic systems have more complex dynamic behaviors and extremely high sensitivity to parameters and initial values. So far, there are few studies on the application of laser chaotic systems to image encryption. Therefore, this paper proposes a new image encryption scheme based on an optical injection semiconductor laser chaotic system. The encryption scheme mainly includes two processes of scrambling and diffusion. The scrambling process converts the pseudo-random sequences generated by the laser chaotic system into chaotic matrixes and scrambling each pixel through a random point scrambling algorithm. In the diffusion process, the chaotic sequences generated by the laser chaotic system are quantized into random numbers and applied to the improved gravitational model algorithm to achieve the effect of pixel diffusion. The experimental results and security analyses indicate that the proposed algorithm has good image encryption performance and can effectively resist various common attacks on image encryption systems.
Highlights
W ITH the rapid development of the communications industry, more and more information is transmitted through the Internet [1]
To intensify the security of cryptosystem, a new image encryption scheme based on the light injection laser chaotic system [54], [55] is proposed in this paper
As shown from the comparison with different schemes in Tab.8 that the ciphertext images encrypted by the proposed cryptosystem have a lower correlation, and the number of pixels change rate (NPCR) and unified average changing intensity (UACI) are closer to the expected values
Summary
W ITH the rapid development of the communications industry, more and more information is transmitted through the Internet [1]. The application of semiconductor laser chaotic system to image secure communication can greatly improve the reliability of the encryption system. To intensify the security of cryptosystem, a new image encryption scheme based on the light injection laser chaotic system [54], [55] is proposed in this paper. This encryption scheme combines the random point scrambling algorithm and the improved gravitation model diffusion algorithm, and a good encryption effect can be obtained by performing a round of encryption on the plaintext image.
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