Three-way call detection using steganography

  • US 7,826,604 B2
  • Filed: 07/24/2007
  • Issued: 11/02/2010
  • Est. Priority Date: 08/05/2003
  • Status: Active Grant
First Claim
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1. A method for detecting the addition of a third party to a pre-existing telephonic connection between a first party and a second party, said method comprising:

  • generating identification data;

    subdividing the identification data into a plurality of subdivisions;

    encoding the plurality of subdivisions onto a carrier signal to create a spread spectrum modulated identification signal, the spread spectrum modulated identification signal comprising the subdivisions of the identification data encoded on a plurality of frequency bands using a predetermined sequence;

    adding the spread spectrum modulated identification signal to a telephone signal to form an encoded telephone signal, the spread spectrum modulated identification signal being imperceptible to a human listener of the telephone signal;

    transmitting the encoded telephone signal across a telephonic connection;

    receiving the encoded telephone signal at a remote location;

    extracting the plurality of subdivisions of the identification data from the spread spectrum modulated identification signal; and

    assembling the plurality of subdivisions of the identification data to re-create the identification data using the predetermined sequence.

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