CPU card is also called smart card. Its function is equivalent to a microcomputer. It not only has the function of data storage, but also has the functions of command processing and data security protection. The metal chip on the integrated circuit card (IC card) that people often use is the CPU card chip.
The integrated circuit in the CPU card contains microprocessor CPU, storage unit (including random access memory ram, program memory ROM (flash), user data memory EEPROM) and chip operating system cos. The CPU card with COS is equivalent to a microcomputer. It not only has the function of data storage, but also has the functions of command processing and data security protection.
Without mastering the key production process, the CPU card chip originally designed in China has been produced abroad. At present, the capacity of CPU card independently designed and manufactured in China has reached 128K.
CPU card can be applied to many fields such as finance, insurance, traffic police and government industries. It has the characteristics of large user space, fast reading speed and supports multiple uses of one card. It has passed the certification of the people's Bank of China and the state commercial secretary Committee.
CPU card classification:
1. Unencrypted memory card
The IC chip in the card is mainly EEPROM, which has the function of data storage, but does not have the function of data processing and hardware encryption.
2. Logical encryption memory card
The encryption logic circuit is added on the basis of the non encrypted memory card. The encryption logic circuit protects whether the data in the card is open to external access by checking the password, but it is only a low-level security protection and can not prevent malicious attacks.