Encryption on power systems real-time data communication

With the rapid development of SPD net, the information security problem of the real-time data which transmitted in plain text mode based on IP, is paid great attention. First the real-time data communication network security and information security of power systems are analyzed. Then, by taking into account the demand for encryption of real-time data communication, the management of the key and the process of real-time data encryption are elaborated. According to the actual situation of power systems, a scheme of one-key-at-a-time and recommend practicable encryption algorithm and the length of key used in power systems are chose. By using the SSL layer embedded between the application layer and TCP layer, the TCP mode of real-time data transmission is accomplished. For the most frequently used UDP mode in power systems, the technique of ACK and time-out for the reliability and the mechanism of key distribution and start-up for the confidentiality and accuracy of transmission are introduced. Finally, the feasibility of real-time data encryption is discussed.