Journal
JOURNAL OF SYSTEMS AND SOFTWARE
Volume 85, Issue 4, Pages 850-858Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jss.2011.10.051
Keywords
Image encryption; Dynamical compound chaos; LFSR; Bilateral-diffusion
Funding
- National Natural Science Foundation of China [60973162]
- Natural Science Foundation of Shandong Province [ZR2009GM037]
- Science and technology of Shandong Province of China [2010GGX10132]
- Scientific Research Foundation of Harbin Institute of Technology at Weihai [HIT (WH) ZB200909]
- Key Natural Science Foundation of Shandong Province of China [Z2006G01]
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Chaos may be degenerated because of the finite precision effect, hence the new compound two-dimensional chaotic function is presented by exploiting two one-dimensional chaotic functions which are switched randomly. A new chaotic sequence generator is designed by the compound chaos which is proved by Devaney's definition of chaos. The properties of dynamical compound chaotic functions and LFSR are also proved rigorously. A novel bilateral-diffusion image encryption algorithm is proposed based on dynamical compound chaotic function and LFSR, which can produce more avalanche effect and more large key space. The entropy analysis, differential analysis, statistical analysis, cipher random analysis, and cipher sensitivity analysis are introduced to test the security of new scheme. Many experiment results show that the novel image encryption method passes SP 800-22 and DIEHARD standard tests and solves the problem of short cycle and low precision of one-dimensional chaotic function. (C) 2011 Elsevier Inc. All rights reserved.
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