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近年来,随着计算机与信号处理技术的发展,模拟语音置乱体制,由于有限的置乱编排空间及已乱语音不可能完全消除语音的声学特性,已被公认为不能提供完全的通信安全。但模拟置乱系统到底能提供多少时间的安全呢?攻击的可能途径是什么?破译的复杂度如何?这对客观地评价体制的前途以及最恰当地确定使用场合是十分重要的。本文分析了目前置乱体制可能的破译条件与攻击途径,置乱语音的密码分析及破译实现;结合常用时、频置乱体制的特点,粗略估算了各常用体制在不同破译条件下的抗破译时间数量级。从中可以看到,在目前最可能的破译条件下,模拟置乱体制能较好地满足大多数用户的保密需求。在文章中,还提出了衡量模拟置乱体制抗破译性能的五条准则。指出在通信从模拟体制向数字化过渡的相当长时间中,模拟置乱体制仍将继续占有重要地位。
In recent years, with the development of computer and signal processing technology and the simulation of voice scrambling system, it has been generally accepted that full communication security can not be provided due to the limited scrambling space and chaotic voice that can not completely eliminate the acoustic characteristics of speech. But how much time does it take to simulate a scrambled system? What are the possible ways to attack? What is the complexity of deciphering? It is important to objectively evaluate the future of the system and determine where it is most appropriate. This article analyzes the possible conditions for the system to decipher the chaos and attacks, the password analysis and deciphering of the scrambling speech. Combining the characteristics of the commonly used and frequently used chaos system, this paper roughly estimates the anti-deciphering of the commonly used systems under different deciphering conditions Time order of magnitude. It can be seen that, under the most possible deciphering conditions at present, the simulation system can better meet the confidentiality needs of most users. In the article, five criteria for measuring anti-deciphering performance are also proposed. Pointed out that in a long period of time between the transition from analog system to digital system, the mock system will continue to occupy an important position.