Method for encryption obfuscation

Patent metadata

Field	Value
Publication number	US-9755674-B2
Application number	US-201514704900-A
Country	US
Kind code	B2
Filing date	May 5, 2015
Priority date	May 5, 2014
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

A system and method provide a signal carrier; an overt persistent digital channel containing a host signal and carried on the signal carrier; a non-persistent channel encoded onto the host signal by timing variation of the host signal, the non-persistent channel including access data for accessing hidden information in the host signal.

First claim

What is claimed is:

1. A system for encoding data in a signal, comprising:
a hardware oscillator to provide at least one signal carrier;
a host data encoder to encode an overt persistent digital channel containing a host signal on the at east one signal carrier;
a hardware modulator coupled to the oscillator and the host data encoder to modulate a non-persistent channel onto the at least one signal carrier; and
the non-persistent channel encoded onto the at least one signal carrier by timing variation of the host signal, the non-persistent channel including access data for accessing hidden information in the host signal, wherein the access data includes at least one of a stencil, a code book and a decryption key.

2. The system of claim 1 , wherein the host signal is an intelligible work of nominal information.

3. The system of claim 1 , wherein the host signal is encrypted and the access data is an encryption key.

4. The system of claim 3 , wherein the encrypted host signal is encoded with a code book to reduce entropy.

5. The system of claim 1 , wherein the timing variation is less than a level of timing stability for detecting and capturing the host signal.

6. The system of claim 1 , further comprising:
a processor coupled to receive the host signal from the at least one signal carrier; and
a high stability oscillator producing a reference signal coupled to the processor for use in reading pulse timing variations of the host signal, wherein the reference signal has a stability greater than the level of timing variations of the host signal; wherein the timing variations of the host signal are smaller than the sampling period for detecting and capturing the data stream.

7. The system of claim 1 , wherein the host signal is a digital data stream, and further wherein the timing variations are pulse timing variations.

8. A method for sending data on a signal carrier, comprising:
providing, by a hardware oscillator, at least one signal carrier;
encoding, using a host data encoder, an overt persistent digital channel containing a host signal on the at least one signal carrier;
modulating, using a hardware modulator coupled to the oscillator and the host data encoder, a non-persistent channel onto the at least one signal carrier, the non-persistent channel encoded onto the at least one signal carrier by timing variation of the host signal, the non-persistent channel including access data for accessing hidden information in the host signal, wherein the access data includes at least one of a stencil, a code book and a decryption key;
reading the timing variations from the host signal for separating the access data from the carrier signal and the host signal; and
accessing the hidden data using the access data.

9. The method of claim 8 , wherein the host signal is an intelligible work of nominal information.

10. The method of claim 8 , wherein the host signal is encrypted and the access data is an encryption key.

11. The method of claim 10 , further comprising encoding the host signal with a code hook to reduce entropy, prior to encoding the host signal with the non-persistent channel.

12. The method of claim 8 , wherein the pulse timing variation is smaller than the sampling period for detecting and capturing the host signal.

13. The method of claim 8 , wherein the host signal is a digital data stream, and further wherein the timing variations are pulse timing variations.

14. The method of claim 8 , wherein the host signal is an analog signal.

Assignees

• Raytheon Co

Inventors

• Graceffo Gary M
• Kowalevicz Andrew M

Classifications

• H04L9/08

  Key distribution {or management, e.g. generation, sharing or updating, of cryptographic keys or passwords (network architectures or network communication protocols for supporting key management in a packet data network H04L63/06)} · CPC title

• H04L7/042

  Detectors therefor, e.g. correlators, state machines (digital correlators in general G06F17/15) · CPC title

• H04L43/087

  Jitter · CPC title

• H04B1/0475 Primary

  with means for limiting noise, interference or distortion (H04B1/0483 takes precedence) · CPC title

• G09C1/00

  Apparatus or methods whereby a given sequence of signs, e.g. an intelligible text, is transformed into an unintelligible sequence of signs by transposing the signs or groups of signs or by replacing them by others according to a predetermined system (cryptographic typewriters G09C3/00) · CPC title