Research Of Audio Hiding Algorithm Based On Chaotic Encryption And DWT-DCT-SVD

In the field of information security,information secretly transmitted mainly uses encryption technology to protect.But the conventional packet encryption technology for information process easily attracts the attention of the enemy,so it is possible for an attacker to crack the secret information.With the growing of computer operation ability,deciphering the traditional cryptograph is becoming simpler.Even if not to decipher,we can also destroy or interfere with the communication process directly.Information hiding as one kind of secure communication technology with excellent camouflage,it can hide the existence of secret information to achieve secure communication.Therefore,whether for civilian or for military communications,research on information hiding technology has a profound practical significance.This paper focuses on the study of chaotic encryption,discrete wavelet transform(DWT),discrete cosine transform(DCT)and singular value decomposition(SVD)of speech information hiding algorithm,and test the performances of the algorithms.The main contents of the full paper are as follows:(1)It describes in detail the basic theory of information hiding,the technical performance requirements,the main application areas and current research status.It analyzes the auditory masking effects of human ears,deeply analyzes the theoretical model of audio information hiding.It summarizes the existing audio hiding algorithms and their characteristics,and gives the general evaluation criteria of the hiding algorithm.(2)In this paper,the chaotic sequence is used to encrypt audio signal,and the commonly used chaotic sequences are briefly introduced.The relation between chaos and cryptography is explained and analyzed,and the classification of chaotic cipher is expatiated.The whole process of chaotic encryption of audio signal is analyzed in this paper.In this paper,we propose two kinds of speech hiding algorithms.The first kind of speech hiding algorithm is implemented based on SVD and quantization in the DWT and SVD domain.In this algorithm,the secret information is embedded into the DWT sub-band of each speech frame.DWT has spatial-frequency localization properties,therefore the transparency of the hidden information is improved,and SVD has a strong stability,the singular value varies little after the attacks from different types of common signals.Another algorithm is proposed based on the first algorithm.Before embedding the secret speech,we first preprocess each speech frame using Logistic chaotic sequence,to improve its privacy and security during the transmission process.Followed by segmenting the carrier audio signal,and then make three levels of DWT to each segment,take out the approximate component.Perform DCT on approximatecomponent.Transforming the first quarter of the transformed coefficients into a two-dimensional matrix,and the matrix is subjected to SVD transform.Secondly,the hidden data is embedded and extracted by hiding algorithm.The simulation results show that this algorithm has a good perception of transparency,and it is able to resist the common signal processing attacks,and has high hiding capacity and good security.Two kinds of algorithms do not require the original carrier speech signal when they extract the secret information,and thus realize the blind extraction of secret information.