Authentication Scheme for Substation Information Security Based on Chaotic Theory

Information security is crucial to electric power system which requires high reliability, security and stability. According to the data and communication security standard IEC 62351 in power systems, authentication is one of the most important security measures. In remote control environment of substation, it is required that the authentication scheme can not only satisfy the authentication demand for substation communication security, but also ensure minimum calculation workload and transport expenses. Using the sensitivity of initial condition of chaotic theory, a new password authentication method based on Chebychev chaotic mapping is presented in this paper. The chaotic sequence is taken as identity mark sequence. Unlike the general OTP authentication, the chaotic authentication system needn´t to maintain the entire sequence in its storage. The authentication between IEDs in substation automation is taken as an example, and the concrete authentication process between IEDs is designed.