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本文考查了一些过去和目前使用的话音加密原理。数字逻辑系统和集成电路器件的出现被看作是使有效加密原理得以实现的一个重要转折点,而在这以前是不可能满意地利用这些原理的。
This article examines some of the past and present uses of voice encryption principle. The advent of digital logic systems and integrated circuit devices is seen as an important turning point in enabling effective cryptography, and until then it has not been possible to exploit these principles satisfactorily.