초록 ▼

A secure communication system comprising signal manipulation and inverse signal manipulation means at the sending and receiving locations respectively, the signal manipulation processes being controlled by keying signals derived according to predetermined operations from another, unrelated signal, s

A secure communication system comprising signal manipulation and inverse signal manipulation means at the sending and receiving locations respectively, the signal manipulation processes being controlled by keying signals derived according to predetermined operations from another, unrelated signal, said signal being readily and reliably available at both sending and receiving locations.

대표청구항 ▼

In a secure communication system including a message source, a signal manipulation device, a transmission medium comprising a cellular telephone network, an inverse signal manipulation device, and a message receiver, the system further including means for deriving a signal manipulation encryption ke

In a secure communication system including a message source, a signal manipulation device, a transmission medium comprising a cellular telephone network, an inverse signal manipulation device, and a message receiver, the system further including means for deriving a signal manipulation encryption keying signal from a publicly broadcast radio signal identically available at both devices, the means for deriving being included in both the signal manipulation device and the inverse signal manipulation device.