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本文介绍可望实现全双工和半双工的保密系统,它们已在实际信道上进行了模拟。从前的文章,主要讨论了一个系统的强度问题(即对偶然窃听者的不可懂度和对有经验窃听者的相对解密分析度)和它的延迟量。但是未提及的一个众所周知的问题是对实际信道中的置乱信号进行解码。本文提出加密系统核心是时段和频段的连续排列结构,它是由Jayant和cox提出的。这种结构以数字处理为基础,将信号分成若干子带,然后将这些子带在时间上和频率上进行排列,以合成一个置乱的模拟信号。对解码过程,我们要讨论信道特性的补偿,模拟信号的再取样及置乱器与解乱器之间的同步建立和保持等问题。
This article describes the security systems that can be expected to achieve full and half duplex, they have been simulated on the actual channel. Previous articles focused on the strength of a system (ie, the degree of inaccuracy of casual eavesdroppers and relative decryption of experienced eavesdroppers) and its amount of delay. However, a well-known problem not mentioned is the decoding of scrambling signals in the actual channel. This paper proposes that the core of encryption system is a continuous arrangement of time periods and frequency bands, which is proposed by Jayant and Cox. The structure is based on digital processing and splits the signal into sub-bands, which are then temporally and frequency-aligned to synthesize a scrambled analog signal. For the decoding process, we will discuss the compensation of channel characteristics, the resampling of analog signals and the synchronization establishment and maintenance between the scrambler and the scrambler.