Research On Data Encryption Of Power System Based On Chaos

The power Internet of things emerge,more and more terminal devices are applied to the power grid.And the power grid data is also huge,data security has become a research focus.The power system data mainly consists of text data and image data.The text data includes the transaction volume of the power system in various forms,power plant power generation,customer information,etc.The image data includes the digital power system wiring drawings.In order to ensure the security and reliability of these data,this dissertation proposes three chaotic encryption algorithms based on chaotic systems.The main contents of the dissertation are:(1)A memristive chaotic system is constructed.Based on the false four wing chaotic system,a piecewise linear memristor is introduced.The dynamic behavior of the system is rich,with the phenomena of line equilibrium and coexisting attractors.Moreover,the existence of coexistence attractor is verified by Multisim circuit simulation and FPGA hardware implementation.(2)Aiming at the security problem of color image in power system,an image encryption algorithm based on memristive chaotic system is adopted.The algorithm integrates memristor chaotic system,Logistic chaotic system and DNA algorithm.Firstly,the plaintext is divided into blocks,and then the sub blocks are subjected to DNA coding and DNA operation in turn.Finally,the rows and columns are scrambled to obtain the ciphertext image.(3)Aiming at the security problem of black-and-white image in power system,an image encryption algorithm based on Logistic chaotic system is adopted.The algorithm combines DCT algorithm and Logistic chaotic mapping,and obtains the ciphertext image by chaotic encryption of the plaintext image transformed by DCT.(4)Aiming at the security problem of power transaction volume in power system,a text information encryption algorithm based on memristive chaotic system is adopted.The algorithm combines hash algorithm and memristor chaotic system,in which hash algorithm is used to change the initial value of chaotic system.Under the action of the initial value,the chaotic system generates a random chaotic sequence,which is used to encrypt the content of the plaintext,so as to obtain the ciphertext.Through the combination of theoretical algorithm and simulation experiment,the above three chaotic encryption algorithms all have good encryption performance.Therefore,the above three chaotic encryption algorithms are suitable for power system data encryption.