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The Study and Implementation of Chaos Ciphers

Author: SunYu
Tutor: LiZongBo
School: National University of Defense Science and Technology
Course: Computer Science and Technology
Keywords: Chaotic Cipher Invariant distribution Digital chaos Finite precision Proliferation Disturb
CLC: TN918
Type: Master's thesis
Year: 2007
Downloads: 147
Quote: 4
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With the continuous development of information technology and the rapid popularization of information security issues have become increasingly prominent , the normal operation of the national economy and national security has become an important issue . The password is the core of information security , chaotic cipher cryptography , a new research direction . This paper first introduces the theory of password history and chaos theory , chaotic development , preliminary inductive analysis of the relationship between chaos theory and the traditional theory , the theoretical analysis on the basis of the problems in the chaotic digitization process , Logistic map the chaotic cryptographic applications because of its uneven distribution balance issues , pointed out that this does not meet the Shannon proposed guidance password -proliferation principles of the two basic principles of design , and data test method analysis and description , put forward a number of improvement measures and performance simulation . On this basis , the design and implementation of chaotic cryptosystems , and security analysis and experimental . Of the main results of this paper include the following aspects: First, the combination of the theory of cryptography , expounded the theory of pseudo-random sequence , the non-linear theory , the theory of linear complexity , complex systems theory and randomness theory summarized Chaos password to learn their relationship. Secondly, the problem of performance degradation in the case of finite precision chaotic cryptosystems computer analysis , and proposed the corresponding countermeasures to reduce the finite precision effect to improve its security and availability . Binding Logistic mapping , data testing and analysis , and proposed measures for improvement and performance analysis . Again , based on analysis of existing theory and data analysis , according to the proposed improvements , design a multi- chaotic cryptosystems and achieve security analysis and processing decrypt experimental .

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