STUDY ON SOME STREAM CIPHERS USING GENERATING FUNCTIONS
几种流密码研究的母函数方法

Several kinds of stream ciphers-complement sequences of period sequences,partial sum of period sequences, inverse order sequences and finitely generated sequences, are studied by using techniques of generating functions. Their minimal polynomials, periods, as well as generating functions are given. As to finitely generated sequences, the change of their linear complexity profiles as well as the relationship between the two generated sequences under the case in which the degree of connected polynomials are fixed, are discussed.