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本文提出了一种前馈流密码纵向信息泄漏的收集方法，并在此基础上深入地研究了具有谱绝对值均匀性质非线性滤波函数的前馈流密码的线性复杂度稳定性问题．
In this paper, a method of collecting longitudinal information leakage of feedforward flow cipher is proposed, and on the basis of the above, the linear complexity stability problem of feedforward flow cipher with nonlinear spectral filter functions of uniform absolute value is studied.