Research Of Audio Information Hiding System Based On Chaos And Lifting Wavelet Transform

Information hiding technology is a research hotspot in the area of information security recent years. As a useful complement to traditional encryption technology, Information hiding technology is used in the filed of covert communications, copyright protection and others. Audio is prevalent multimedia information in many communication environments such as network. It is an important component of the multimedia communication. Therefore, the information hiding technology with audio vector plays an important role in applications and the research is of great practical significance.Firstly, this paper introduces the basic theory and concepts of information hiding ,chaotic encryption and wavelet transform, and then integrates it to the practical application,and so on proposes two information hiding methods with high-capacity which based on chaotic encryption and lifting wavelet transform. The algorithm which based on the audio sample dots inversion hides secret information by changing the vector's wavelet domain coefficient's polarity correspond. The corresponding coefficient will be modified to the same polarity when hiding information 1; when the hidden-information is 0, the corresponding coefficient will be amended to the opposite polarity. The change of coefficients follows specific rules, and controls by setting the thresholds. The experiment results show this algorithm has good performance in imperceptibility and robustness, the theoretical hidden capacity can be achieved half of vector's data; In addition, this paper also proposes a audio information hiding algorithm based on differential encoding creatively. This algorithm hides secret information through determine whether the amplitude of sample dots is jump, If the sample dot is not jump, we hiding the information 1; on the other side, we hide the information 0. The result of simulation experiment shows that the method has good performance in hiding and capacity.