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该文讨论了数论变换在异步保密系统中的应用.首先对数论变换应用后系统所出现的问题进行了描述,然后分析,讨论了这些问题产生的原因,并针对输入信号动态范围的扩展,数论变换非线性控制等提出了相应的解决方法,这些方法在实践中得到了证明“,”This paper discuss the application of Number Theoretic Transform(FNT)in asynchronous speech encryption systems First some problems of the system after using FNT are discribed Then it analizes and discuss the reasons of these problems.Finnally it gives some resolution methods on expanding the dynamic area of inputing signals nonlinear controling of FNT and so on which have been proved in practical application