基于微型加密算法的IEC 61850-9-2LE报文加密方法

电力广域通信的发展使得电力采样数据大范围共享成为可能,但采样数据面临信息泄露和遭受恶意篡改的风险,经典的采样报文加密方法由于过大的运算耗时而难以在工程实践中应用。文中结合IEC 61850-9-2LE采样报文特点,提出一种针对采样报文关键内容进行微型加密算法(TEA)运算的加密方法,并利用循环冗余校验(CRC)验证码进行解密后的报文完整性检查。采用典型的电力系统嵌入式硬件平台进行定量的效率验证,所提方法加密含8个服务应用数据单元的IEC 61850-9-2LE报文信息仅耗时0.181 ms,满足电力实时报文传输处理时间4 ms的要求。

An Encryption Method for IEC 61850-9-2LE Packet Based on Tiny Encryption Algorithm

The development of power wide-area information network leads to the possibility of sharing sampled data to a great extent. However, sampled message in power information network is thus prone to malicious attack such as information leakage and tampering. The obstacle to applying the classical encryption algorithm in sampled message is its high time consumption that can hardly satisfy the real-time requirement of sampled data. Based on the characteristics of IEC 61850-9-2LE sampling packets, the method of encrypting packet crucial information only by tiny encryption algorithm(TEA)operation is proposed. Cyclic redundancy check(CRC)checksum of IEC 61850-9-2LE packet is used to ensure message integrity in the method proposed. The popular power embedded hardware is used for quantitative efficiency test. The time consuming for encrypting eight service application data units in IEC 61850-9-2LE packet is only 0. 181 ms, which satisfies the real-time packet transmission and processing requirement of less than 4 ms.