据《Defense Electronics》1989年5月报道:Cylink公司研制了一种话音加密装置。该装置接在任一标准按键式电话中,可对公共电话、微波及卫星网范围内的机敏信息提供保护。该装置可以密话和明话两种方式全双工操作,且受控于与之相接的电话。据厂商说,这种话音加密装置体积很小,足以适合安装在电话或简易铸件中。当该装置 According to “Defense Electronics” reported in May 1989: Cylink company developed a voice encryption device. Connected to any standard push-button phone, the unit protects sensitive information in the public telephone, microwave and satellite networks. The device can be full-duplex operation both in the squeak and in the clear, and is controlled by the connected phone. According to the manufacturer, this voice encryption device is small enough to fit into a telephone or simple castings. When the device