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›› 2004, Vol. 21 ›› Issue (4): 512-519.DOI: 10.7523/j.issn.2095-6134.2004.4.013

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On Constructing of Combiners with Memory

MA Wei-Ju, FENG Deng-Guo, WU Zhi-Ping, YANG Hai-Bo   

  1. State Key Laboratory of Information Security, Graduate School of the Chinese Academy of Sciences, Beijing 100039, China
  • Received:2003-09-15 Revised:2004-02-17 Online:2004-07-10
  • Supported by:

    the National Key Foundation Research“973 Project (G1999035802),National Science Fund for Distinguished Young Scholars (60025205) and National Natural Science Foundation of China (60273027)

Abstract:

The concepts of nonlinear complexity and correlation immune order of combiner with memoryare proposed in this paper.By analysis, we can see that they are two important criteria for designingcombiner with memory.Another design criterion is that the output function and next-state function shouldbe balanced.According to these new design criteria for combiner with memory, we construct a kind ofkeystream generators that have good properties.Its correlation immune order can be any 1 ≤k ≤(N -1), and its nonlinearity can be obtained by modifying some Boolean functions.

Key words: combiner, memory, nonlinearity, correlation immune order

CLC Number: