Chaitoc Ace And Chaotic CRT-PTS Encryption Algorithm For Secured Optical OFDM Transmission

With the continuous development of communication technology,optical fiber communication has gradually become an indispensable physical layer communication technology in the communication network because of its material characteristics.On the other hand,Orthogonal Frequency Division Multiplexing(OFDM)is based on orthogonal multi-carrier frequency division multiplexing modulation technology,which can achieve multi-carrier modulation due to fast discrete Fourier transform and greatly reduce the computational complexity of the system [3].Regardless of how communication technology constantly updates iterations,the issue of communications security has always been a matter of great concern.Taking into account the initial value of the digital chaos sensitivity and randomness and other advantages,in the field of confidential communications of great practical value.Based on the research of several brothers in the laboratory,this paper proposes two new types of digital chaos encryption algorithm.On the basis of theoretical research,this paper verifies these two digital chaotic encryption algorithms based on optical OFDM access network PON)transmission reliability.The following are the three key research contents of this thesis:1)Based on the digital chaos frame interleaving scheme,the digital chaos system and the constellation expansion technique are combined for the first time to propose a scheme based on digital chaos to generate the interlaced frame information.This scheme is equivalent to using digital chaos system,A set of frame interleaver with encryption function.The frame interleaver based on digital chaos system only needs to know the initial value and the number of iterations to construct the de-interleaving information completely by itself,reducing the transmission of the sideband information of the system and improving the utilization of the frequency band.2)In the CRT-PTS encryption scheme based on digital chaos,we creatively combine the Chinese residual theorem with partial transmission sequences.We propose to look at a scheme for transmitting 14-bit data using 3 16 QAM points(that is,12 bits)Sideband information can be transmitted through the chaos system to achieve the sender and demodulator-side key sharing.3)By improving the technology of interlacing based on the digital chaos,the coefficient of the chaotic system equation is closely related to the ciphertext obtained in the previous plaintext encryption,so that a plaintext that can affect multiple ciphertexts is effectively chosen.