Research On Speech Information Hiding Algorithm Of Energy Comparison Based On DCT And DWT

With the rapid development and change of Internet information technology,More and more attention has been paid to the security of confidential information such as trade secrets,personal privacy and national security.In order to prevent important data from being attacked,stolen and used by others,information hiding technology becomes an effective way to solve the problem.This technology provides security for the secret information,and makes the important data more secure and reliable.The information hiding technology mainly conceals the secret information in the public information,so that the observer or the listener cannot find the secret information hidden in the public information.Speech is one of the most commonly used methods in people's information communication,so the research on the security of secret information transmission based on voice carrier has a high development space and research value.At present,the research of information hiding algorithm based on speech carrier is mainly concentrated in the time domain and transform domain.Compared with the transform domain algorithm,the robustness of the time domain algorithm is poor.In the transform domain,under certain conditions,combining the characteristics of some transform domain algorithms,it can better control the embedding strength of confidential information,and has good robustness.In order to further enhance the robustness and security,and reduce the bit error rate of secret information extraction,to ensure the imperceptibility of secret information,to achieve the best hidden effect.In this paper,firstly,the existing discrete cosine transform(DCT,Discrete Cosine Transform)is improved.On this basis,combined with the characteristics of discrete wavelet transform(DWT,Discrete Wavelet Transform),a new information hiding algorithm is implemented.The simulation experiment is carried out to verify the information hiding algorithm,and good results are obtained.The main contents of this paper are as follows:(1)Speech information hiding algorithm based on DCT intermediate frequency coefficient.The speech signal is mainly processed by DCT,and combines with the masking effect of human audio system(HAS)to achieve the hidden information.In the DCT coefficients,the intermediate frequency coefficients are obtained.The secret information is embedded into the speech carrier by modifying the DCT coefficients,and then uses the inverse transform to restore the voice signal to send.Matlab is used to simulate the algorithm,The simulation results show that the proposed method has minimal effect on the quality of voice carrier,which indicates that the algorithm has good imperceptibility,and has good robustness against resampling and echo interference.(2)Energy comparison speech information hiding algorithm based on DCT and DWT.The algorithm is based on the first information hiding algorithm,It uses the advantages of better stability and better control of embedding strength in DCT domain,and combined with the multi-resolution analysis ability of DWT,to study the coefficients of the speech carrier in the transform domain.At the same time,combines with the masking effect of human audio system to achieve the hidden information.The secret information is embedded into the voice carrier by modifying the medium and high frequency coefficients of DWT,and then uses the reverse process to restore the voice information and send.The algorithm further enhances the robustness and imperceptibility of voice information hiding,and the security of secret information is further protected.