IC card meter classification

Meter used according to the type of IC card is divided into: a memory card, logical encryption card, CPU card, three types. For the energy meter, IC card is to achieve electricity usage rights of the carrier, the electricity sector will purchase electricity user permissions (data) loaded in the IC card, IC card into the power user Table, the meter reads the data in the IC card through the electric load switching control right to the user. From the foregoing, the function of  circuit breakers  is achieved through the IC card, IC card in the power supply - electricity from the transmission of data between the role of the entire sale of electricity, electrical systems, strictly implement a Table and a card, the IC card, data  power transformers  is particularly important. Early use of the memory card with the purchase of electricity is the password data while writing on the card, the encryption algorithm is relatively simple and easy to be cracked, and the meter is fixed encryption algorithm, password once broken, the meter are the same unit of production Public, is not conducive to the management of the electricity sector. Electric energy meter  card has two encryption methods, the card has a password, card data is encrypted and can not continuously operate the card the wrong password three times. Encryption of data on the card may set their own electricity sector, security of data on the card , Confidentiality has been enhanced. CPU card encryption algorithm is very complex, tables, card password is randomly generated, the exchange of data needed tables, card, mutual authentication, not a fixed value, while the meter password control in the hands of power supply bureau, to solve the above two categories card table due to the production Product manufacturers can not disclose their password and the same power supply bureau can not sell electricity interconnection problems, so that manufacturers and suppliers to use separate, help to promote the application of the product.