基于混沌序列的变电站信息加密方法

Substation information encryption method based on chaotic series

对于电力系统这样一个可靠性和安全稳定性要求很高的系统而言,信息安全问题尤其突出。IEC62351-3指出加密和身份认证是两大核心安全措施,因此,寻求安全性高的有效的加密算法和协议以满足变电站信息传输的安全性成为必要。给出一种基于Chebychev混沌映射的数据加密方法,鉴于在变电站的远程控制环境中,连接持续的时间一般较长,而在长久的连接持续时间中,始终采用同一个加密密钥是不安全的,所提出的混沌加密算法通过使用外部密钥和定义每次的加密粒度,使得混沌加密密钥在持久连接中能够进行重新协商,混沌映射的外部密钥取自TLS的主密钥,实现一次一密、一字一密。

Information security is crucial to electric power system which requires high reliability, security and stability. According to IEC 62351 - 3, cncryption and authentication are two important ,security measures. So investigating more secure and more effective encryption algorithm to satisfy substation security communication is needed. A chaotic encryption algorithm based on Chebychev chaotic mapping is presented. In remote control environment of substation, duration of connection is quite long. Using one encryption key during the long time connection is not secure. By using external key and defining encryption granularity in the chaotic encryption algorithm, the encryption key can be renegotiated during persistent connection. The master key of TLS is adopted as the external key of the chaotic mapping. Once encipherment and one word encipherment are implemented.