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.