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中文摘要：
研究了Rijndael算法中非线性变换S盒的构造机制，通过类似的方法构造出了一批密码性能接近最优的4×4和6×6的S盒，这些小规模的S盒为进一步构造密码性能良好的大的S盒提供了资源。对这类S盒的雪崩概率进行统计分析，从而找到若干规律，这将有助于生成安全性更高、规模更大的S盒。
英文摘要：
The construction principle of nonlinear transformation S-box in Rijndael algorithm was studied, and based on the principle, a number of 4×4 and 6×6 S-boxes with some good cryptographic properties that are close to the best ones were constructed in the paper. These small S-boxes can be used as resources to further construct large S-boxes with several good cryptographic properties. The avalanche probabilities of these S-boxes were statistically analyzed, and several rules were discovered, it will be a great help to construct safer and larger S-boxes.
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