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中文摘要：
S盒是许多加密算法唯一的非线性部件，其安全性对这些算法的密码分析至关重要。S盒输出的布尔表达式（即模2域上的代数多项式）被用于衡量S盒的非线性度等用途。在已知S盒真值表情况下，对求S盒各输出布尔表达式的各种算法进行了探讨和总结。其中，折半异或法在普通PC计算机上只需要m2-1次操作，其中m为S盒的输入位数，且不需要占用额外的内存。
英文摘要：
S box is the only nonlinear component of many encryption algorithms, its security is important to the cryptanalysis of these algorithms. Output Boolean expression of the S box is used to measure the degree of the nonlinearity of S box. Known truth table, various algorithms on computing output Boolean expression of the S box are discussed and summarized. Among them, the fold XOR method only requires rn2m-1 operations in PC computers where m is the input bit number of S box, and does not require additional memory.
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Generalized synchronization in an array of nonlinear dynamic systems with applications to chaotic CN
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