Intelligent electric meter main control chip and security encryption method

Abstract

The invention provides an intelligent electric meter main control chip. The intelligent electric meter main control chip comprises an internal bus, a main processor module, a data storage module and at least one application module, wherein the main processor module, the data storage module and the application module are connected to the internal bus, and the application module comprises a metering module. A security control module is further integrated inside the chip, is connected to the internal bus and has a security encryption function. The chip further comprises a storage protecting module, wherein the storage protecting module is connected between the main processor module and the internal bus and is configured for shielding illegal memory access instructions. Due to the fact that the security control module is arranged inside the main control chip and connected with a center processing module through the internal bus, security holes of a security control chip of an application software bypass of an intelligent electric meter terminal can be effectively avoided, and meanwhile production and testing cost is reduced. The invention further provides a security encryption method based on the intelligent electric meter main control chip and a certificate authorization center, and security of an electric system is guaranteed further.

Description

technical field [0001] The invention relates to a smart meter main control chip with security encryption function and a security encryption method based on the chip. Background technique [0002] At present, the State Grid Corporation of China has carried out the comprehensive and unified construction of the electricity consumption information collection system for power users. The power collection terminals used in a large number of systems are designed in accordance with the unified design. Power collection terminals generally use an independent security chip called an Embedded Secure Access Module (ESAM) to achieve security protection. [0003] Since the application software used by the main control unit of the smart meter terminal to realize the main functions of the meter terminal is developed by many uncertain manufacturers, for the purpose of security management, key sensitive information such as keys cannot appear in the main control unit Therefore, the ESAM chip is...

AI Technical Summary

Problems solved by technology

[0005] 1) The command forwarding of all security operations and the utilization of ESAM chip execution results still require the main processor module of the main control chip as an intermediate or final node. Therefore, it may be due to the needs of debugging and testing or application software design loopholes, etc. Causes the application software to bypass the security operation process that must be performed for the normal operation of the smart meter terminal and directly bypass the ESAM chip

Once such security loopholes appear, it will greatly harm the interests of power operators;

[0006] 2) Since there is a public key exchange process between the master station and the meter terminal, the open ESAM chip interface will bring the risk of counterfeiting ESAM chips;

[0007] 3) An independent form of ESAM chip must be pre-implanted with a test key and installed on the meter terminal to facilitate development, production and testing, which will inevitably lead to an increase in the cost of production and testing, as well as the production management and installation of ESAM chips. a lot of overhead

In a symmetric cryptographic system, multiple meter terminals will share the same key, so once a certain level of key is leaked due to key management and other reasons, all related keys under it will be invalid, and the scope of influence will be large

[0009] Patent CN102111265A discloses an ESAM chip-based encryption method using a hybrid cryptosystem (SM1) and an asymmetric encryption system (RSA), which adds an asymmetric encryption algorithm to the ESAM chip to solve the problem of symmetric Key management (key generation, storage and distribution) in the cryptographic system is difficult, but since there is a public key exchange process in the public key system, it will increase the risk of counterfeiting the ESAM chip through the external interface opened by the ESAM chip. Potential safety hazards to the entire power system

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