本文利用IDEA体制中的MA—结构构造出了一种128比特长的对合置换，并对其性质进行了简要的分析。

This paper constructs an involution permutation with 128 bits long by use of the MA-structure in IDEA and simply analyses its properties.

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基于S-P网络中P置换的重要性和加解密的一致性，本文提出了对合型列混合变换的概念，并对其代数结构、枝数和计数问题进行了深入地研究和分析。

Based on the importance of P transform and coherence in encryption-decryption in the S-P networks, we put forward the definition of involution-typed mixcolumn transform.

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结论TKA术后虽然髌骨与股骨滑车的对合关系保持正常，但在三维立体空间内髌骨的内外倾模式与幅度较未置换前发生了变化。

Conclusion Even the relationship between patella and femoral trochlea remains normal, the mode and magnitude of patellar tilting changes significantly after TKA.

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