Methods and systems for providing interference based physical-layer encryption

A method of recovering encrypted information comprising:

• receiving a composite carrier signal using a receiving device, the composite carrier signal comprising a previously combined information carrier signal, interference signal, and spread sub-carrier synchronization signal, wherein the interference signal has one or more signal characteristics that results in obfuscation of the information carrier signal by the interference signal in the composite signal;
• despreading the spread sub-carrier synchronization signal using a despreader;
• demodulating the despread sub-carrier synchronization signal using a demodulator;
• decoding the demodulated despread sub-carrier synchronization signal using a decoder, resulting in extracted synchronization information from the sub-carrier synchronization signal;
• synchronizing an interference generator using the extracted synchronization information such that the interference generator creates a replica of the interference signal contained in the received composite signal;
• and
• cancelling the interference signal from the composite signal using a cancelling device that uses one or more cancellation techniques to obtain the information carrier signal.

A system for encrypting an information carrier comprising:

• a sequence generator configured to generate a sequence of data;
• a first modulator configured to modulate an output from the sequence generator such that an interference signal results;
• an encoder configured to encode synchronization information generated by the sequence generator;
• a second modulator configured to modulate the encoded synchronization information such that a synchronization carrier signal results;
• a spreader configured to spread the synchronization carrier signal such that a spread sub-carrier synchronization signal results;
• and
• a combiner configured to combine a modulated information carrier signal, the interference signal, and the spread sub-carrier synchronization signal using a signal combiner such that a composite signal results, the interference signal having one or more signal characteristics that results in obfuscation of the information carrier signal when the information carrier signal and interference signal are combined.

A system of recovering encrypted information comprising:

• a receiving device configured to receive a composite carrier signal, the composite carrier signal comprising a previously combined information carrier signal, interference signal, and spread sub-carrier synchronization signal, wherein the interference signal has one or more signal characteristics that results in obfuscation of the information carrier signal by the interference signal in the composite signal;
• a despreader configured to despread the spread sub-carrier synchronization signal;
• a demodulator configured to demodulate the despread sub-carrier synchronization signal;
• a decoder configured to decode the demodulated despread sub-carrier synchronization signal, resulting in extracted synchronization information from the sub-carrier synchronization signal;
• an interference generator configured to be synchronized using the extracted synchronization information and create a replica of the interference signal contained in the received composite signal;
• and
• a canceling device configured to cancel the interference signal from the composite signal using one or more cancellation techniques to obtain the information carrier signal.