Systems and methods to send and receive encrypted DTMF digits in a data flow

• US 7,676,027 B2
• Filed: 06/30/2005
• Issued: 03/09/2010
• Est. Priority Date: 06/30/2005
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Laurent, Pierre, Hassane, Mehdi
• Primary Examiner(s): Gauthier; Gerald
• Application Number:
  US11/172,628
• Publication Number:
  US 20070025331A1
• Time in Patent Office: 1,713 Days
• Field of Search: 379/93.33, 379/283, 379/406.08, 379/386, 379/88.13, 379/88.2, 704/226, 370/526, 846/88, 380/266, 380/277, 455/564, 702/70, 705/70
• US Class Current: 379/88.13
• CPC Class Codes: G06Q 20/108 Remote banking, e.g. home banking
• CPC Class Codes: H04K 1/02 by adding a second signal to make the desired signal unintelligible
• CPC Class Codes: H04M 1/2535 adapted for voice communication over an Internet Protocol [IP] network Voice over Internet Protocol (VoIP) network equipment and services H04M7/006; implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP] H04L69/16
• CPC Class Codes: H04M 11/066 Telephone sets adapted for data transmision
• CPC Class Codes: H04M 7/0078 Security; Fraud detection; Fraud prevention
• CPC Class Codes: H04M 7/1295 Details of dual tone multiple frequency signalling

Abstract

Systems and methods provide for embedding white noise signals representing DTMF digits into a voice data stream.

Claims

1. A method for execution by one or more processors, the method comprising:

generating a plurality of white noise signals according to one or more encoding keys;

associating the plurality of white noise signals to a plurality of DTMF events;

detecting by the one or more processors a DTMF event of the plurality of DTMF events; and

embedding by the one or more processors one of the plurality of white noise signals associated with the DTMF event into a data packet in place of a DTMF tone associated with the DTMF event.

2. The method of claim 1, further comprising re-associating the plurality of white noise signals to the plurality of DTMF events after embedding one of the plurality of white noise signals such that a new association of white noise signals to DTMF events is formed.

3. The method of claim 1, wherein the plurality of white noise signals are generated according to the output of an encryption engine.

4. The method of claim 3, further comprising sending one or more key values used to initialize the encryption engine to a receiving system.

5. The method of claim 3, further comprising receiving one or more key values to initialize an encryption engine on the receiving system.

6. The method of claim 1, wherein embedding one of the white noise signals includes convolving one of the white noise signals with the audio data.

7. A method for execution by one or more processors, the method comprising:

generating a plurality of white noise signals according to one or more encoding keys;

associating the plurality of white noise signals to a plurality of DTMF tones;

receiving by the one or more processors a data packet;

determining by the one or more processors the presence of a white noise signal from the plurality of white nose signals in the audio data packet;

if the white noise signal is present, then issuing a DTMF tone associated with the white noise signal.

8. The method of claim 7, further comprising re-associating the plurality of white noise signals to the plurality of DTMF tones upon determining the presence of the white noise signal such that a new association of white noise signals to DTMF events is formed.

9. The method of claim 7, wherein the plurality of white noise signals are generated according to the output of an encryption engine.

10. The method of claim 9, further comprising sending one or more key values used to initialize the encryption engine to a sending system.

11. The method of claim 9, further comprising receiving one or more key values to initialize an encryption engine on the sending system.

12. The method of claim 7, wherein detecting the presence of one of the white noise signals includes comparing the least significant bits of the data packet with a table of least significant bits of values computed from the white noise signals.

13. A system comprising:

a processor and at least one memory;

a data structure in the memory to associate a plurality of white noise signals with a plurality of DTMF tones;

a cipher engine to read one or more keys and to generate a set of values used to determine the association of the plurality of white noise signals with the DTMF tones in the data structure; and

an encoding component executed by the processor to detect a DTMF event and to embed an associated white noise signal into a data packet.

14. The system of claim 13, wherein the encoding component is further operable to reset the data structure to a second association the plurality of white noise signals to the plurality of DTMF events upon detecting the DTMF event.

15. The system of claim 13, wherein the cipher engine is further operable to generate a set of values used to generate the plurality of white noise signals.

16. A machine-readable medium having stored thereon machine executable instructions for performing a method, the method comprising:

generating a plurality of white noise signals according to one or more encoding keys;

associating the plurality of white noise signals to a plurality of DTMF events;

detecting a DTMF event in the plurality of DTMF events; and

embedding one of the plurality of white noise signals associated with the DTMF event into a data packet.

17. The machine-readable medium of claim 16, wherein the method further comprises re-associating the plurality of white noise signals to the plurality of DTMF events after embedding one of the plurality of white noise signals such that a new association of white noise signals to DTMF events is formed.

18. The machine-readable medium of claim 16, wherein the plurality of white noise signals are generated according to the output of an encryption engine.

19. The machine-readable medium of claim 18, wherein the method further comprises sending one or more key values to used to initialize the encryption engine to a receiving system.

20. The machine-readable medium of claim 18, wherein the method further comprises receiving one or more key values to initialize the encryption engine.

21. The machine-readable medium of claim 16, wherein embedding one of the white noise signals includes convolving one of the white noise signals with the audio data.