Journal of Information Processing Systems

Korea Information Processing Society (한국정보처리학회)
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Modified Multi-Chaotic Systems that are Based on Pixel Shuffle for Image Encryption

  • Verma, Om Prakash (Dept. of Information Technology, Delhi Technological University) ;
  • Nizam, Munazza (Dept. of Information Technology, Delhi Technological University) ;
  • Ahmad, Musheer (Dept. of Computer Engineering, JMI University)
  • Received : 2012.11.13
  • Accepted : 2013.05.12
  • Published : 2013.06.29
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Abstract

Recently, a pixel-chaotic-shuffling (PCS) method has been proposed by Huang et al. for encrypting color images using multiple chaotic systems like the Henon, the Lorenz, the Chua, and the Rossler systems. All of which have great encryption performance. The authors claimed that their pixel-chaotic-shuffle (PCS) encryption method has high confidential security. However, the security analysis of the PCS method against the chosen-plaintext attack (CPA) and known-plaintext attack (KPA) performed by Solak et al. successfully breaks the PCS encryption scheme without knowing the secret key. In this paper we present an improved shuffling pattern for the plaintext image bits to make the cryptosystem proposed by Huang et al. resistant to chosen-plaintext attack and known-plaintext attack. The modifications in the existing PCS encryption method are proposed to improve its security performance against the potential attacks described above. The Number of Pixel Change Rate (NPCR), Unified Average Changed Intensity (UACI), information entropy, and correlation coefficient analysis are performed to evaluate the statistical performance of the modified PCS method. The simulation analysis reveals that the modified PCS method has better statistical features and is more resistant to attacks than Huang et al.'s PCS method.

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