Encryption and decryption method of OFDM-PON system based on cell neural network

Abstract

The invention belongs to the technical field of the optical communication encryption, and specifically relates to an encryption and decryption method of an OFDM-PON system based on a cell neural network. The encryption method comprises the following steps: constructing a dynamic key set of the cell neural network, performing summation and modulo operation on input digital signals, and taking an obtained value as an index value of the dynamic key set of the cell neural network; determining an initial value of the cell neural network through the index value, thereby generating a corresponding chaotic sequence as a synchronization sequence of the OFDM-PON system; performing plaintext-chosen attack resistant encryption on the original data by utilizing the chaotic sequence generated by the cell neural network and the index value; and entering optical fiber transmission after the OFDM modulation and electro-optical modulation conversion. By utilizing the chaotic characteristic of the cell neural network, multiple initial values are combined as a key set, the key is randomly selected every time to improve the dynamic feature of the key; and a plaintext-chosen attack resistant encryptionscheme is constructed by utilizing the randomness of plaintext sending, and the security is high.

Description

technical field [0001] The invention belongs to the technical field of optical communication encryption, and in particular relates to an encryption and decryption method of an OFDM-PON system based on a cellular neural network. Background technique [0002] In recent years, with the continuous improvement of social information and the emergence of emerging services such as cloud computing, high-definition video, and virtual reality, end users have higher and higher requirements for access bandwidth, access capacity, and access service capabilities. Passive Optical Network (PON), as a terminal access technology of Fiber To The Home (FTTH), is considered to be one of the best solutions for solving broadband optical access problems at low cost. Among them, PON (OFDM-PON) based on Orthogonal Frequency Division Multiplexing (OFDM), due to its inherent advantages, such as easy expansion of channel capacity, high spectral efficiency, and strong anti-multiple The ability to avoid p...

AI Technical Summary

Problems solved by technology

Although the above schemes realize the encryption of physical layer data, the chaotic system dimension of these encryption schemes is low, and the degree of chaos is not enough, so the randomness of the generated chaotic sequence will be greatly reduced, which seriously affects the security of the encryption system

[0004] In addition, most of the current physical layer encryption schemes based on OFDM-PON cannot resist selective plaintext attacks, and the transmitted data is easily stolen by illegal intruders, and the current physical layer encryption technology generally encrypts the transmitted information, while the The encryption of the key is rarely involved, and the key is generally a static key, and the receiving end uses a fixed key to encrypt and decrypt information, so that the key is easily stolen by illegal intruders in the long run

Images