KSII Transactions on Internet and Information Systems (TIIS)

Korean Society for Internet Information (한국인터넷정보학회)
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The fast image encryption algorithm based on substitution and diffusion

  • Zhang, Yong (School of Software and Communication Engineering, Jiangxi University of Finance and Economics) ;
  • Jia, Xiaoyang (Changchun China Optical Science & Technology Museum)
  • Received : 2017.12.27
  • Accepted : 2018.05.08
  • Published : 2018.09.30
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Abstract

A fast image encryption system based on substitution and diffusion was proposed, which includes one covering process, one substitution process and two diffusion processes. At first, Chen's chaotic system together with an external 256-bit long secret key was used to generate the key streams for image encryption, in which the initial values of Chen's chaotic system were regarded as the public key. Then the plain image was masked by the covering process. After that the resulting image was substituted with the disturbed S-Box of AES. Finally, the substituted image was diffused twice with the add-modulo operations as the core to obtain the cipher image. Simulation analysis and comparison results with AES and some existing image cryptosystems show that the proposed image cryptosystem possesses the merits of fast encryption/decryption speed, good statistical characteristics, strong sensitivity and etc., and can be used as a candidate system of network security communication.

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References

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