混沌系統(tǒng)的魯棒性研究及在圖像加密中的應(yīng)用
[Abstract]:The vigorous rise of science and technology and information technology has brought the opportunity of the rapid development of information technology to the whole world. While enjoying the enormous benefits brought by the information network, people are also faced with the enormous challenge of information security. As an important carrier and transmission medium of information, the security of image has been paid more and more attention. The core tool of information security is encryption. With the increasing complexity of communication environment and the improvement of decoding ability, some traditional cryptographic algorithms are compromised or their security is threatened, which requires more advanced cryptographic design theory and innovative technology. The discovery of chaos is the third revolution in physics in the 20 th century. Some characteristics of chaotic dynamics coincide with the requirements of cryptography. Chaotic cryptography has become one of the hot topics in cryptography. In 1975, Li-Yorke first defined the term of chaos in mathematical language, and put forward a famous theorem of chaos in three cycles. Zhou Hailing and Song Enbin put forward and proved a chaotic robust theorem about quadratic polynomials by using Li-Yorke theorem. Yang Xiuping and others proposed and proved a chaotic robustness theorem for cubic polynomials. In 1999, Banerjee et al proposed a chaotic robust theorem for standard forms of two-dimensional piecewise smooth mappings. In 2001, Andrecut et al proposed a chaotic robust theorem for S unimodal mappings. Min Lequan and Chen Guanrong proposed an image encryption scheme SESAE based on d bit key stream which has the effect of key avalanche and increases the difficulty of deciphers. Based on the previous work, the robustness, pseudo random number generator and avalanche image encryption scheme of discrete chaotic systems are studied in this paper. The main achievements and innovations of this paper are as follows: (1) the robustness of some discrete chaotic systems is studied in this paper based on Li-Yorke chaos discrimination theorem and chaotic discriminant theorem of S unimodal mapping. A robust chaos theorem for constructing one-dimensional piecewise nonlinear mappings and a robust chaos theorem for cubic polynomial mappings are presented. By improving the chaos robust theorem of the standard form of two-dimensional piecewise smooth mapping, this paper presents the equivalent chaos discrimination theorem for the standard form of two-dimensional piecewise smooth mapping, and gives the necessary conditions for constructing four-dimensional discrete chaotic mapping. This paper provides a theoretical proof for constructing chaotic system and a new tool for chaotic application. (2) the design and performance detection of pseudorandom number generator is based on the new robust chaos theorem of discrete system. Six new discrete chaotic generalized synchronization systems are constructed by trigonometric functions and chaotic generalized synchronization theorems. Using these six discrete chaotic generalized synchronization systems, this paper optimizes the design of six chaotic pseudorandom number generators (CPRNGs).) with large key space. The pseudorandom performance of CPRNGs and RC4 algorithm is tested by using the improved FIPS 140-2 and SP800-22 detection standards published by (NIST) of the National Institute of Standards and Technology. The results show that the random performance of CPRNGs is comparable to that of RC4 algorithm and ZUC algorithm. The 14-15 items detected by SP800-22 of two CPRNGs are superior to those of RC4 and ZUC. (3) A stream encryption scheme with key avalanche and clear text avalanche and a block encryption avalanche scheme are proposed in this paper. The research work of image encryption scheme SESAE with avalanche effect is generalized.
【學位授予單位】:北京科技大學
【學位級別】:博士
【學位授予年份】:2016
【分類號】:TP309.7
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