Research On New Algorithm Of Pseudorandom Sequence And Video Security Protection Technology

With the rapid development of Internet and multimedia technology,video security issues are of general concern to society.There is a growing need for a more secure video protection mechanism.Pseudo-random sequences are widely used in the field of secure communication and cryptography.Chaotic pseudo-random sequence has become one of the most popular research topics with its randomness and large key space.In order to solve the problem that the existing pseudo-random sequence is low and the key space is small,two different ps eudo-random sequence algorithms are designed,and the implementation schemes of pseudo-random sequence in video security protection are explored.The main work of this paper is as follows:(1)This paper analyzes the design of pseudo-random sequence.This paper summarizes the shortcomings of the current pseudo-random sequence algorithm,studies the design idea of the sequence cipher,and analyzes the basic principle of the pseudo-random sequence generation algorithm.At the same time,this paper studies H.264 video codec technology,analysis the working principle.These studies provide solid theoretical support for the follow-up work in this paper.(2)Firstly,this paper analyzes the shortcomings of the coupled map lattice model,and proposes an improved coupled map lattice model.The CML model is optimized from the local reaction equation and the coupled spatial structure.The new key parameter is introduced as the amplification factor to further increase the key space.At the same time,a pseudo-random sequence discretization scheme based on coupled map lattice is proposed.Secondly,the pseudo-random sequence generated by coupled map lattice model is applied to the design of video encryption algorithm.The encryption of video data is realized by designing encryption algorithm for intra prediction mode and CAVLC entropy coding.Finally,the security of the pseudo-random sequence and the security of the video encryption are tested and analyzed respectively.The experimental results show that the pseudo-random sequence algorithm and the video encryption algorithm have high security.(3)This paper designs a pseudo-random sequence algorithm based on Chen system and DNA coding.The four-dimensional hyperchaotic system is proposed to extend the Chen system.In the design of the pseudo-random sequence discrete algorithm,the basic idea of DNA coding is introduced,and t he generation process of pseudo-random sequence is completed by DNA operation.The scheme further enhances the key space while improving the securit y of pseudo-random sequence.(4)In order to establish a diversified video security protection mechanism,this paper designs a joint watermark encryption scheme based on the video encryption algorithm.In the video joint watermark encryption scheme,a vide o sequence will be divided into two parts,one of which is used to design the video encryption algorithm,and the other part will be used to design the watermarking algorithm,which is logically independent of each other.Finally,the security of video joint watermark encryption scheme is tested and analyzed in detail.In this paper,the pseudo-random sequence algorithm and video security protection technology have been studied.We proposed two different types of pseudo-random sequence algorithm.At the same time,for the video encryption algorithm is not enough to complete the copyright certification,this paper designed two different types of video security protection program.The experimental results show that the pseudo-random sequence algorithm proposed in this paper has high randomness and has a large key space.Video encryption scheme and video joint watermark encryption scheme have wide application prospect and practical value under the premise of satisfying different security performance requirements.