Smart card and data write-in method

Abstract

The present invention relates to various IC cards and a method of writing data into the IC cards. A smart card comprises a microcontroller and an interface ensuring that the smart card can communicate with a reading / writing terminal. The microcontroller comprises a microprocessor, a ROM, a RAM, an EEPROM and an I / O circuit. The ROM, the RAM, the EEPROM and the I / O circuit are connected to the microprocessor through a data bus, wherein, an exchange zone used for writing data each time is arranged inside the EEPROM. The data structure of the exchange zone comprises exchange zone control information and a data exchange zone, wherein, the exchange zone control information comprises an exchange zone data effective mark, an exchange zone data writing times counter, an exchange zone data next empty block address, a data writing target address array, a bad block counter and an exchange zone data check code. A buffer zone which corresponds to and exchanges data with the exchange zone is arranged in the RAM. The smart card of the present invention is high in data storage security, and can guarantee data writing integrity and accuracy each time.

Description

technical field [0001] The invention relates to various IC cards and a method for writing data into the IC cards. Background technique [0002] Figure 1 is a block diagram of the electrical part of the smart card. The circuit shown in Figure 1 comprises a microcontroller 1 constituting the electronic chip of the smart card and an interface 2 enabling the card to communicate with a read / write terminal (not shown). The microcontroller 1 mainly includes a microprocessor 10, storage units 20, 30, 40 input and output circuits 50 and storage units 20, 30, 40 and input / output circuits 50 and a data bus 60 connecting them to the microprocessor 10 . The storage unit 20 is a read only memory (ROM) containing a management chip or a computer program called an "operating system". The storage unit 30 is a random access memory (RAM) for temporarily storing data processed by the microprocessor 10 . The storage unit 40 is an EEPROM unit for storing user-specific data such as name, passwo...

AI Technical Summary

Problems solved by technology

[0005] Said method has two main shortcoming: one, the whole process realizes the time relatively long; Two, in carrying out step E3 or E4 process, if abnormal situation (such as power failure etc.) takes place, easily cause the original data in the EEPROM target zone to be destroyed. Erase, but new data is not written, resulting in data loss

However, this technical solution still cannot solve the aforementioned second shortcoming, that is, data security cannot be guaranteed

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