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| 1 | Novel way to research nonlinear feedback shift register显示文摘In this paper,we regard the nonlinear feedback shift register(NLFSR)as a special Boolean network,and use semi-tensor product of matrices and matrix expression of logic to convert the dynamic equations of NLFSR into an equivalent algebraic equation.Based on them,we propose some novel and generalized techniques to study NLFSR.First,a general method is presented to solve an open problem of how to obtain the properties(the number of fixed points and the cycles with different lengths)of the state sequences produced by a given NLFSR,i.e.,the analysis of a given NLFSR.We then show how to construct all 22n-(l-n)/22n-lshortest n-stage feedback shift registers(nFSR)and at least 22n-(l-n)-1/22n-l-1shortest n-stage nonlinear feedback shift registers(nNLFSR)which can output a given nonperiodic/periodic sequence with length l.Besides,we propose two novel cycles joining algorithms for the construction of full-length nNLFSR.Finally,two algorithms are presented to construct 22n-2-1different full-length nNLFSRs,respectively. | ZHAO DaWei PENG HaiPeng LI LiXiang HUI SiLi YANG YiXian | 2014 | Science China(Information Sciences)2014，57，9： | 7 |
| 2 | 流密码快速相关攻击综述显示文摘为了分析流密码密钥流生成器在抵御快速相关攻击方面的安全性,对各种快速相关攻击算法进行了研究.介绍了快速相关攻击的基本模型,对相关研究成果进行了归纳与梳理.分析了一次通过方法、迭代译码方法和多步法方法这三类方法的优缺点.然后介绍目前的最新进展:扩域上快速相关攻击和采用单项式映射的快速相关攻击.接着讨论快速相关攻击的实际应用,并与其他攻击方法进行了比较分析.最后展望了未来的研究方向,即改进扩域上快速相关攻击算法,改进算法攻击新的流密码方案,综合使用多种攻击方法来破解流密码方案,将快速相关攻击应用到其他密码方案上. | 潘森杉 夏文涛 王良民 | 2017 | 江苏大学学报(自然科学版)2017，38，5： | 2 |
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