Encryption and decryption module and meter reading system suitable for DLMS/COSEM communication protocol

Abstract

The invention provides an encryption and decryption module and a meter reading system suitable for a DLMS / COSEM communication protocol, the encryption and decryption module is applied to an electric energy meter and a reading device in the meter reading system, the encryption and decryption module comprises an encryption and decryption main control chip, an encryption and decryption interface circuit, an encryption and decryption power supply circuit and an operation indicating lamp, and the encryption and decryption main control chip is used for completing encryption and decryption operation of data; the encryption and decryption interface circuit is used for data and signal interaction between the encryption and decryption module and an external module; the encryption and decryption power supply circuit is used for converting a power supply level input by the encryption and decryption interface circuit into a level required by the encryption and decryption module; and the operation indicating lamp is used for displaying the operation state of the encryption and decryption module. According to the encryption and decryption module and the meter reading system, an encryption algorithm is separated from a service program, so that encryption is safer and more reliable; the key is stored in the encryption and decryption module, so that the key is effectively prevented from being stolen; the encryption and decryption module integrates various encryption algorithms in DLMS / COSEM communication, system developers do not need to develop any more, the burden of the developers is relieved, and the product development period is shortened.

Description

technical field [0001] The invention belongs to the field of electric power, and in particular relates to an encryption and decryption module and a meter reading system suitable for the DLMS / COSEM communication protocol. Background technique [0002] DLMS / COSEM (DLMS: Device Language Message Specification, device language message specification, COSEM: Companion Specification for Energy Metering, energy metering supporting specification) communication protocol is the International Electrotechnical Commission to solve the automatic meter reading system and data acquisition in the metering system, A new communication standard for electric energy meters proposed for issues such as instrument installation, maintenance, and system integration. It has become a relatively complete meter communication protocol standard so far with good system interconnection and interoperability. [0003] For security, data is generally encrypted during communication. In practical applications, diff...

AI Technical Summary

Problems solved by technology

[0005] As mentioned above, in the existing system design, the data encryption and decryption module is not independent in the design, but integrated in the application software, developed and maintained by software developers. Such a design idea obviously has potential safety hazards

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