Data transmission security encryption method for metering automation system

Abstract

The invention discloses a data transmission security encryption method for a metering automation system. The data transmission security encryption method includes steps of (1), a host transmits scattering factors and random digit getting command requests to an encryptor; (2) the encryptor generates a random digit L1 of 8 bytes and utilizes the scattering factors and a terminal service main secret key to generate a terminal service sub secret key, generates a session key via the random digit L1 and the terminal service sub secret key, encrypts the random digit by the session key to generate a ciphertext E1; the encryptor feeds the random digit L1 and the ciphertext E1 to the host; (3), the host transmits an identity verification request containing the ciphertext E1 and low 4 bytes of the random digit number L1 to a smart terminal; and (4), after the smart terminal receives the identity verification request, the session key is generated by encrypting the low-4 bytes of the random digit number L1 with the self service sub secret key. By adopting the ciphertext during data transmission, data confidentiality is guaranteed, data reliability is guaranteed by checking in an MAC (media access control) manner, and system safety is guaranteed by generating the session secret key.

Description

technical field [0001] The invention relates to the technical field of electric power data transmission, in particular to a method for securely encrypting data transmission in a metering automation system. Background technique [0002] The existing metering automation system generally includes smart electric energy meters, metering terminals and master stations. Energy meters and metering terminals are collectively referred to as smart terminals. The existing metering automation system collects the metering data of the smart energy meter through the metering terminal, completes the remote automatic meter reading to the main station, and at the same time realizes the purpose of remote real-time monitoring of the metering terminal and the smart meter. [0003] At present, there are two main data transmission methods in the metering automation system: the first is the data method, because this method does not use any encryption measures, the security of the data transmission i...

AI Technical Summary

Problems solved by technology

[0003] At present, there are two main data transmission methods in the metering automation system: the first is the data method, because this method does not use any encryption measures, the security of the data transmission is extremely poor, and it is easy to be intercepted; the second is the plaintext data and password. For the setting of key parameters such as control and rate, this encryption method is generally used.

However, the existing encryption method has the following defects: (1) The password is still transmitted in plain text in the actual use process, which is easy to be intercepted by eavesdropping; (2) The data is only simply verified during the transmission process, so the intercepted data is tampered , and it is not easy to be found; (3) the password is the same in all terminal devices, and after one is intercepted, it will be available in all terminals

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