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本文利用多次选代混沌映射来设计非线性前馈型流密码，在理想实现条件下，混沌前馈型流密码不仅对混沌密码参数和驱动信号的变化十分敏感而且具有均衡的分布特性．本文还考察了在有限精度实现下，混沌前馈型流密码体制中存在的问题及解决方法
In this paper, we design the nonlinear feedforward-type stream cipher using multiple alternative chaotic maps. Under ideal conditions, the chaotic feedforward stream cipher is not only sensitive to the changes of chaotic cipher parameters and driving signals, but also has a balanced distribution. This paper also investigates the problems existing in the chaos feedforward-type stream cipher system and its solutions under the limited precision