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基于正弦反馈Logistic混沌映射的图像加密算法及其FPGA实现 被引量:18
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作者 李春彪 赵云楠 +1 位作者 李雅宁 孔思晓 《电子与信息学报》 EI CSCD 北大核心 2021年第12期3766-3774,共9页
基于混沌的数字图像加密算法因具有较大的密钥空间和较高的密钥敏感特性等而被广泛地应用。该文在经典Logistic映射中引入正弦反馈,构成新的映射关系,并分析该映射的混沌行为。利用混沌映射导出离散混沌加密序列,并对加密序列进行放大取... 基于混沌的数字图像加密算法因具有较大的密钥空间和较高的密钥敏感特性等而被广泛地应用。该文在经典Logistic映射中引入正弦反馈,构成新的映射关系,并分析该映射的混沌行为。利用混沌映射导出离散混沌加密序列,并对加密序列进行放大取整,增强其伪随机性;利用NIST随机性测试方法测试了加密序列的伪随机性;将伪随机序列与原始图像进行异或运算,实现图像加密。数值仿真结果表明所提加密算法具有较好的加密效果,其密钥也具有较好的敏感性和伪随机性,最后基于FPGA平台的硬件加密实现了本算法。 展开更多
关键词 图像加密 LOGISTIC混沌映射 正弦反馈 FPGA NIST
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A memristive map with coexisting chaos and hyperchaos
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作者 孔思晓 李春彪 +2 位作者 贺少波 Serdar C¸ic¸ek 赖强 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第11期286-296,共11页
By introducing a discrete memristor and periodic sinusoidal functions,a two-dimensional map with coexisting chaos and hyperchaos is constructed.Various coexisting chaotic and hyperchaotic attractors under different Ly... By introducing a discrete memristor and periodic sinusoidal functions,a two-dimensional map with coexisting chaos and hyperchaos is constructed.Various coexisting chaotic and hyperchaotic attractors under different Lyapunov exponents are firstly found in this discrete map,along with which other regimes of coexistence such as coexisting chaos,quasiperiodic oscillation,and discrete periodic points are also captured.The hyperchaotic attractors can be flexibly controlled to be unipolar or bipolar by newly embedded constants meanwhile the amplitude can also be controlled in combination with those coexisting attractors.Based on the nonlinear auto-regressive model with exogenous inputs(NARX)for neural network,the dynamics of the memristive map is well predicted,which provides a potential passage in artificial intelligencebased applications. 展开更多
关键词 MEMRISTOR HYPERCHAOS coexisting attractors amplitude control neural network
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