论文部分内容阅读
据《Communications International》一九八五年八月报道:美国技术通信公司推出了一种电话保密装置CSD 280B TW。这种电话保密装置可使通过电话线路传输的敏感信息和重要信息免遭偷听和截收,令非法收听到的通话是不可懂的。CSD 280系统不但能在时域和频域内同时对话音信号加密,而且还能保证恢复话音的质量。CSD 280系列有180亿种密码(密钥)组合,符合政府和军用战术保密标准。利用一个组合式插口,CSD 280BTW可很容易地与任何标准电话接口。
According to “Communications International” reported in August 1985: The United States technology communications company launched a telephone confidential device CSD 280B TW. This telephone security device protects sensitive information and important information transmitted over telephone lines from eavesdropping and interception, making unheard calls unintelligible. The CSD 280 system not only encrypts voice signals simultaneously in the time and frequency domains, but also guarantees the quality of the recovered voice. The CSD 280 Series has 18 billion combinations of passwords (keys) that meet government and military tactical secrecy standards. With a modular jack, the CSD 280BTW easily interfaces with any standard telephone.