The invention discloses an intelligent
power grid safety communication method based on a combination
cipher. The combination
cipher is adopted, one key is used for completing operation such as
session key agreement,
encryption and signature, and the method adopts an offline / online mode, and as for an intelligent power meter with limited storage space and limited computing power, the needed storage space can be reduced and the computing speed is enhanced. A
transfer station is arranged between the intelligent power meter and a power meter
data management center (MDMS), and private keys corresponding to the power meter, the
transfer station and the MDMS are generated by a
key generation center (PKG). A
session key is firstly generated between the power meter and the
transfer station, and the
session key is used for realizing two-way
authentication and carrying out communication. Then, a chain transmission mode is adopted, the transfer
station acquires data of power meters in a governing range of the transfer
station, certain safety operation is carried out, the data are then transmitted to the adjacent next transfer
station, and by such analogy, the data finally reach the MDMS.