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Image Security System Using Bit-level Operation Based on hyper-chaos System

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Image Security System Using Bit-level Operation Based on Hyp...

A Bit Level Encryption Scheme Based on hyper-chaotic System Combing with the Ideology of Central Dogma

第三届教学管理与课程建设学术会议

作者： Xiangyu Sun College of Computer Science, Chongqing University Chongqing, P.R.China

In order to overcome the shortcoming of the existing image encryption schemes [1, 2], a novel self- adaptive image security system using bit-level operation based on hyper-chaos is presented. In the proposed scheme, a 2D Logistic chaotic map is used to scramble the position of image pixels. Then, in order to obtain the effect of diffusion, the pseudorandom sequences generated by hyper-chaotic system are utilized to change the values of permutated image pixels. Simulation experiment results indicate that the proposed algorithm is of high security. It can not only possess a large key space but can also resist exhaustive attack, differential attack and chosen-plaintext attack, etc.

关键词： Image encryption 2D Logistic hyper-chaos chaos-based cipher

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Chinese Journal of Electronics 2018年第3期27卷 595-602页

作者： ZHANG Shun YANG Liang ZHANG Yuan GAO Tiegang College of software Nankai University

An image encryption scheme based on confusion and diffusion is proposed. In the proposed scheme,original images are transformed into other forms, such as binary streams and ‘hyper-image’, firstly. Then the confusion process is achieved by permutation on the pixel level,the binary bit level, and the ‘hyper-image’ level respectively. Moreover, the diffusion process is operated on the‘hyper-image’ level by bitwise e Xclusive or(XOR) calculation with random sequence generated by a hyper-chaotic system. Furthermore, the central dogma in molecular biology is utilized in the construction of hyper-image, which demonstrates its superiority. Both the theoretical analysis and the experimental results have demonstrated the efficiency and validity of the proposed scheme, and images can be encrypted sufficiently through the three-time permutation and the chaotic substitution.

关键词： Image encryption Bit-level encryption Central dogma hyper-chaos

Hopf bifurcation analysis and circuit implementation for a novel four-wing hyper-chaotic system

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Chinese Physics B 2013年第8期22卷 325-332页

作者：薛薇齐国元沐晶晶贾红艳郭彦岭 Department of Automation Tianjin University of Science & Technology F'SATI/Department of Electrical Engineering Tshwane University of Technology

In the paper, a novel four-wing hyper-chaotic system is proposed and analyzed. A rare dynamic phenomenon is found that this new system with one equilibrium generates a four-wing-hyper-chaotic attractor as parameter varies. The system has rich and complex dynamical behaviors, and it is investigated in terms of Lyapunov exponents, bifurcation diagrams, Poincare maps, frequency spectrum, and numerical simulations. In addition, the theoretical analysis shows that the system undergoes a Hopf bifurcation as one parameter varies, which is illustrated by the numerical simulation. Finally, an analog circuit is designed to implement this hyper-chaotic system.

关键词： hyper-chaos four-wing chaotic system one equilibrium Hopf bifurcation circuit implementation

Pitchfork bifurcation and circuit implementation of a novel Chen hyper-chaotic system

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Chinese Physics B 2012年第3期21卷 92-100页

作者：董恩增陈增强陈在平倪建云 Department of Automation Nankai University Department of Automation Tianjin University of Technology

In this paper, a novel four dimensional hyper-chaotic system is coined based on the Chen system, which contains two quadratic terms and five system parameters. The proposed system can generate a hyper-chaotic attractor in wide parameters regions. By using the center manifold theorem and the local bifurcation theory, a pitchfork bifurcation is demonstrated to arise at the zero equilibrium point. Numerical analysis demonstrates that the hyper-cha^tic system can generate complex dynamical behaviors, e.g., a direct transition from quasi-periodic behavior to hyper-chaotic behavior. Finally, an electronic circuit is designed to implement the hyper-chaotic system, the experimental results are consist with the numerical simulations, which verifies the existence of the hyper-chaotic attractor. Due to the complex dynamic behaviors, this new hyper-cha^tic system is useful in the secure communication.

关键词： hyper-chaos Chen system pitchfork bifurcation center manifold theorem

One-way hash function based on hyper-chaotic cellular neural network

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Chinese Physics B 2008年第7期17卷 2388-2393页

作者：杨群亭高铁杠 College of Software Nankai University

The design of an efficient one-way hash function with good performance is a hot spot in modern cryptography researches. In this paper, a hash function construction method based on cell neural network with hyper-chaos characteristics is proposed. First, the chaos sequence is gotten by iterating cellular neural network with Runge Kutta algorithm, and then the chaos sequence is iterated with the message. The hash code is obtained through the corre- sponding transform of the latter chaos sequence. Simulation and analysis demonstrate that the new method has the merit of convenience, high sensitivity to initial values, good hash performance, especially the strong stability.

关键词： one-way hash function hyper-chaos cellular neural network Runge Kutta formula

5D hyper-Chaotic System with Multiple Types of Equilibrium Points

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Journal of Shanghai Jiaotong university(Science) 2020年第5期25卷 639-649页

作者：徐昌彪吴霞何颖辉莫运辉 School of Communication and Information Engineering Chongqing University of Posts and TelecommunicationsChongqing 400065China School of Optoelectronic Engineering Chongqing University of Posts and TelecommunicationsChongqing 400065China

A chaotic system with various equilibrium types has rich dynamic behaviors.Its state can switch flexibly among different families of attractors,which is beneficial to the practical applications.So it has been widely concerned in recent years.In this paper,a new 5D hyper-chaotic system is proposed.The important characteristic of the system is that it may have multiple types of equilibrium points by changing system parameters,namely,linear equilibrium point,no equilibrium point,non-hyperbolic unstable equilibrium point and stable hyperbolictype equilibrium point.Furthermore,there are hyper-chaotic phenomena and multi-stability about the coexistence of multiple chaotic attractors and the coexistence of hyper-chaotic attractors and chaotic attractors in the system.In addition,the system,complexity is analyzed.It is found that the complexity is close to 1 in the hyper-chaotic state and a pseudo-random sequence generated by the system passes all the statistical tests.Finally,an analog circuit of the system is designed and simulated.

关键词： hyper-chaos equilibrium point multi-stability pseudorandom sequence chaotic circuit

Transition　From　hyper－Chaotic　State　to　Quasi－Steady　State　in　a　Spailally　Distributed　Nonlinear　System

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Wuhan University Journal of Natural Sciences 1996年第1期1卷 42-44页

作者： Yao Duanzheng Shu Chang Long Tao Xiong Guiguang (Department of Physics, Wuhan University, Wuhan 430072, China)

The dynamic characteristic in a spatially distributed nonlinear system, a subset of lasers in an array of coupled lasers, has been studied and analysed numerically. The evolution, with the increasing coupling strength,from stable quiescent state to chaotic state, to hyper-chaotic state and, back to quasi-steady state has been observed in this system.

关键词： hyper-chaos quasi-steady state non-linear system