Split delay-line oscillator for secure data transmission

A system, comprising:

• a hybrid circuit at each of a first device and a second device to allow a feedback loop generating a shared carrier signal to be carried over a single bidirectional signal path;
• and
• a split delay-line oscillator spanning the first device and the second device, the split delay-line oscillator operable to modulate a frequency of the shared carrier signal;
• wherein the first device and the second device to create a shared secret based on the data transmitted on the frequency-modulated shared carrier signal.

A method, comprising:

• frequency-modulating a shared carrier signal by a first device, wherein the first device is communicably coupled to a second device to form a split delay-line oscillator to transmit the shared carrier signal and the second device is also frequency modulating the shared carrier signal;
• synchronizing the frequency modulations of the shared carrier signals by the first device with frequency modulations of the shared carrier signal performed by the second device;
• transmitting random bit streams by the first device on the shared carrier signal;
• receiving, at the first device, random bit streams on the shared carrier signal from the second device;
• and
• establishing a shared secret based on data in the bit streams transmitted on the synchronized, frequency-modulated shared carrier signal.