Research On Digital Audio Encryption Algorithm Based On Chaos

With the advent of 5G era,the tide of big data and cloud computing sweeping the world,data has become the core of the development of digital economy and an important strategic resource of the country,ensuring data security is an important and urgent task in the current information age.As one of the important carriers of multimedia information,digital audio has been widely used.The protection of audio data and copyright has been widely concerned.Encryption of audio data is the most direct and effective way to protect data security.Compared with text and image,audio not only has the characteristics of high redundancy and high correlation,but also has a large amount of data.Therefore,the traditional text encryption method and image encryption algorithm are not suitable for audio.The excellent characteristics of chaotic system,such as quasi randomness and extreme sensitivity to initial values,are very suitable for the basic requirements of cryptography,so chaotic encryption has gradually become an important research method in the field of audio encryption.In recent years,researchers have put forward many encryption algorithms based on chaos theory,but the research results are mainly concentrated in the field of chaotic image encryption,and the research on audio chaotic encryption algorithm is less.At the same time,the existing algorithms inevitably have some shortcomings.After analyzing the defects of the existing algorithms,this paper proposes two chaotic audio encryption algorithms from the level of one-dimensional chaotic map and high-dimensional chaotic system.The main research contents are as follows:From the perspective of one-dimensional chaotic map,a hybrid audio encryption algorithm based on SL Chaotic Map(SLCM)and Hopfield Chaotic Neural Network(HCNN)is proposed.Firstly,the hash value of plain audio is converted to one-time key to achieve a one-time encryption mechanism.Secondly,in view of the defects of existing on e-dimensional chaotic map,such as chaotic degradation,simple and predictable dynamic behavior,narrow chaotic range or periodic window,a compound SL chaotic map is designed by using Sine map and Logistic map,and its chaotic sequence is used in the scrambling process.Finally,in order to solve the problem of insufficient key space of single chaotic map,HCNN is introduced to generate strong randomness diffusion matrix,which is used in XOR diffusion process.From the perspective of high dimensional chaotic system,a bit-level audio encryption algorithm based on chaotic dislocation projection synchronization and chaotic dynamic S-box is proposed.First,a dislocation projection synchronization scheme for complex Chen chaotic systems is presented,which is robust and flexible.Secondly,the true random noise source is introduced as the key audio,and the hash values of the key audio and the plaintext audio are used to generate the initial values and the number of iterations of the chaotic system,ensuring that different key streams are used to repeated encryption of the same audio.Then,the audio data is scrambled by using the coordinate mapping relationship before and after the chaotic sequence ordering.Finally,a method to generate chaotic dynamic S-box is proposed,which ensures that each encrypted S-box changes automatically.The validity of the new S-box is verified by various evaluation criteria.Binary audio data is transformed non-linearly at bit level using S-box.Through the key space,key sensitivity,audio histogram,peak signal-to-noise ratio,audio channel correlation and other indicators,the security analysis of the above two algorithms is more comprehensive and strict.Experimental simulation and security analysis show that the two algorithms can effectively encrypt digital audio,and are superior to other audio encryption algorithms in peak signal-to-noise ratio and audio channel correlation,so they have good practicability and security.