据《Security》1989年4月刊报道,由Cylink Securephone公司研制的话音加密器能连接各种标准的按钮电话,并能通过公用电话、微波和卫星网络保护敏感的通话。这种加密器使用密话和明话工作,它受话机控制,可放在电话机下面或公文包内,并能保护呼叫不受远程通话的影响。当以密话方式工作时,所采用的话音编码可把话音信号压缩成2400 bps的数字序列。编了码的话音信号或用DES加密,或用Oylink专用的加密算法加密。加密后变成数字或话音序列,并由内装的Modem发送出去。 According to the April 1989 issue of Security, the voice cipher developed by Cylink Securephone connects to standard push-button phones and protects sensitive calls over the public telephone, microwave and satellite networks. This cipher, which uses both celibate and plaintext, is controlled by the phone and can be placed under the phone or in a briefcase and protects the call from long-distance calls. When working in cipher mode, the voice encoding employed can compress the voice signal into a 2400 bps digital sequence. Encoded voice signals are either encrypted with DES or encrypted with Oylink-specific encryption algorithms. Encrypted into a digital or voice sequence, and sent by the built-in Modem.