故提出层次代码编码体制，及其代码识别和控制函数。
Hierarchical code system, identifying code and control functions was presented.
我们利用该新算法以更低的计算复杂度计算出了LILI - 128流密码体制的降次函数。
When applied to LILI-128 cryptographic system to construct depressed functions, the new algorithm obtains a lower computational complexity.
在这些密码体制中，欧拉函数起着重要作用。
In these cryptosystems, Euler totient functions play an important role.
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