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Steganography in digital signal encoders

  • US 8,412,519 B2
  • Filed: 08/29/2007
  • Issued: 04/02/2013
  • Est. Priority Date: 09/15/2006
  • Status: Active Grant
First Claim
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1. A method for embedding steganographic information into signal information of a signal encoder, comprising:

  • providing data information, in particular voice information, as a signal to be coded;

    selecting steganographic information as data to be embedded, wherein said steganographic information is selected from a set of steganographic information items; and

    generating a code word from a provided algebraic code book using the signal encoder as a function of an algebraic construction rule based on the code elements forming the code word, so that;

    (a) the data information is encoded, by using the generated code word within the scope of a transmission standard which can be associated with the code book, into signal information containing the code word or pointing to the code word, in the form of an encoded signal;

    (b) the generated code word has an additional characteristic which can be calculated as a function of the code elements forming the code word, the additional characteristic representing the steganographic information; and

    (c) the code book is sub-divided as a function of the algebraic construction rule into a set of sub-code books, and in each case only one code word associated with the sub-code book selected by the steganographic information to be current embedded is output by the signal encoder.

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