Research On Social Multimedia Encryption Algorithm Based On Chaos

With the popularity of Internet social platforms,social media has become an indispensable part of people's life.The social concern caused by the security of multimedia information is becoming more and more prominent,and ensuring the security of multimedia information transmission has become an urgent problem to be solved.Traditional multimedia information encryption algorithms have high complexity in both time and space.Combined with the large amount of original data,high data redundancy and complex coding format of multimedia data,it is difficult for traditional multimedia information encryption algorithms to obtain practical applications in mobile terminals.In order to solve the above problems,this paper studies the chaotic encryption technology and several mainstream multimedia data formats,and designs and implements several chaotic social multimedia data encryption schemes.The main research contents of this paper are as follows:1.Aiming at the security problem of single scrambling or diffusion image encryption algorithm,this paper proposes an image encryption scheme based on Arnold transform,Logistic and Henon multi-mapping.In the aspect of image scrambling,based on the derivation of the formula of image scrambling degree and the study of the periodicity of Arnold transform,the application and extension of classical Arnold transform are carried out to meet the requirements of image scrambling of non-uniform width.In terms of image diffusion,in view of the problems of narrow chaotic parameter interval and small key space in a single low-dimensional chaotic system,the Logistic and Henon double chaotic mapping system is used to complete the diffusion of image pixels.Experimental simulation and result analysis show that this encryption scheme can not only disrupt the distribution and correlation of image pixels,but also effectively resist common decryption attacks such as statistical attack and exhaustive attack.2.Optimize the existing audio and video chaotic encryption algorithm.Combined with the mainstream audio and video encoding technology,this paper uses a more complex or novel chaotic system to complete the rapid encryption of audio and video data.For the encryption of MP3 audio,this paper chooses the scaling factor in the MP3 compressed domain as the encryption object of audio data,and uses the encryption algorithm combined with Tent mapping and Chen's chaotic system to encrypt the scaling factor.Simulation results show that the audio encryption scheme has good security,and does not affect the audio encoding format and compatibility.In the aspect of video encryption,this paper focuses on the current mainstream and widely used H.264 codec standard,conducts detailed research and analysis on the H.264 codec technology and codec stream,and carries out data segmentation and encrypted object extraction on the encoded video codec stream under the requirement of ensuring the compatibility of codec stream and not affecting the video codec.The compressed video stream is selectively encrypted by using the encryption algorithm combining Hash function and complex Lorenz chaotic system.The simulation results show that the encryption scheme has almost no effect on the video compression ratio,ensures the encryption efficiency and does not reduce the security of the system,and meets the requirements of video encryption in social networking occasions.3.Aiming at the incompatibility of mobile phone operating systems and the wide variety of applications that are frequently encountered by social network users at present,this article designs application software architecture based on application design goals,choose the WeChat mini programs platform to develop and implement the social multimedia information encryption mini programs with image encryption,audio and video encryption,network transmission and other functional modules.