supported by the National Natural Science Foundation of China(No.61272042,No.61100202,No.61170235,No.61100200);China Postdoctoral Science Foundation(No.2013M531174)
In this paper, we partly determine the cycle structure of two types of Nonlinear feedback shift registers(NFSRs). Based on these results, the cycle structure of a class of NFSRs with symmetric feedback functions can b...