US 8,412,519 B2 · Steganography in digital signal encoders

Abstract

In a method for embedding steganographic information into the signal information of a signal encoder, a solution is to be created, which enables steganographic information being embedded into the signal information of a signal encoder such that a reduction of the voice quality is largely avoided. This is achieved by means of providing data information, particularly voice information, selecting steganographic information from a quantity of steganographic information, generating a code word from a code book provided by means of the signal encoder on the basis of the code elements forming the code book such that with the use of the code word generated within the scope of a transmission standard associated with the code book the data information is encoded into signal information containing the code word and/or making reference to the code word; and by the code word generated having an additional feature that can be calculated on the basis of the code elements forming the code word, wherein the additional feature represents the steganographic information.

Claims18

Dependent claims

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.

5 more elements

A signal encoder for embedding steganographic information into signal information of the signal encoder (100), characterized by

a first device for receiving data information, in particular voice information, as a signal to be encoded;
a second device for receiving steganographic information as data to be embedded, wherein the steganographic information is selected from a set of steganographic information items;
a third device for 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) by using the generated code word within the scope of a transmission standard which can be associated with the code book, the data information is encoded into signal information containing the code word or pointing to the code word, in the form of an encoded signal;
that
(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 said 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 currently embedded is output by the signal encoder.

5 more elements

Dependencies are inferred from the claim text.

Steganography in digital signal encoders

Life of this patent

Steganography in digital signal encoders

Life of this patent

Abstract

Claims18