Research On Virtual Optical Encryption Algorithm Based On Qi Hyperchaos And AES

With the advent of the 5G era,network information security issues will be more severe and complex than in the past.As one of the important carriers of multimedia information transmission and storage,images can intuitively convey information and have a huge impact on people’s lives.If the image is intercepted or destroyed during transmission,the privacy of the individual will be affected,and the safety of social and corporate property,or even national security,will be endangered.Therefore,image encryption plays an important role in the field of information security.Since the end of the last century,various encryption algorithms have emerged in the field of image encryption.However,as the scale of image transmission increases,the requirements for encryption concurrency and encryption speed become higher and higher,and optical image encryption has become a hot spot for scholars.As a typical optical encryption system,dual random phase encoding(DRPE)derives many improved algorithms,but the system still has the weakness of weak security.Therefore,this paper proposes a virtual optical encryption algorithm based on Qi hyperchaos and AES.It improves the dual random phase encoding system from the overall architecture and key of the algorithm,and improves the security of the encryption system in multiple directions.The main research contents of this paper are:(1)Use the hyperchaotic sequence generated by the four-dimensional Qi hyperchaotic system to generate the encryption key required in the encryption system,combined with the custom control parameters plus the 9 initial parameters of the Qi hyperchaotic system itself As a chaotic key,it effectively improves the overall key space of the encryption system.(2)It is proposed to use AES symmetric encryption to perform secondary encryption on the output plane of DRPE to protect DRPE from threats such as pulse attacks and phase retrieval to improve the encryption system The ability to resist selected plaintext attacks and known plaintext attacks and enhance the overall security of the encryption system.(3)Using the plaintext pixel average value and the control parameters related to the plaintext combined with the chaotic sequence to make the random phase version of the DRPE and the round key and S box of the AES encryption system,effectively solving the random phase version of the DRPE system The shortcomings of the relatively fixed key and S box in the AES encryption algorithm.(4)The final ciphertext image is obtained through the combination of pixel bit position disorder and RGB channels to achieve the effect of further hiding information,and the final digital image ciphertext is easier to print and transmit directly than traditional optically encrypted ciphertext.By building the overall algorithm structure on the computer,and performing experimental simulation and performance analysis on the algorithm,including histogram analysis,statistical analysis,differential attack resistance analysis,classic attack analysis,robustness analysis,and key space analysis.After a number of analyses and comparative experimental analysis,the encryption algorithm in this paper can effectively encrypt plaintext image information,at the same time it can effectively resist a variety of attacks and has good security.