Data protection method of radio frequency smart card

Abstract

The invention discloses a data protection method of a radio frequency smart card, and the method comprises the following steps of: receiving a write instruction through a radio frequency module so as to obtain application identification codes; backing up the raw data corresponding to the application identification codes in a data storage area to a date backup area, and setting and writing a start identification into an identification storage area; writing new data into the data storage area; setting a finish identification when the wireless transaction is finished, and then writing the finish identification into the identification storage area; when the radio frequency smart card is reset or electrified again, checking the identification storage area firstly so as to judge whether data exception occurs; if the judgment result is 'no', enabling the radio frequency smart card to enter the normal working state; and if the judgment result is 'yes', writing the data in the data backup area into the data storage area again. According to the data protection method of the radio frequency smart card, the data can be recovered when the write operation is interrupted accidentally during the wireless card wiping process, so that the card wiping speed can not be influenced, and the use safety and reliability of the radio frequency smart card are improved.

Description

technical field [0001] The invention relates to a smart card, in particular to a data protection method for a radio frequency smart card. Background technique [0002] Radio Frequency Identification (RFSIM, Radio Frequency Subscriber Identity Model) card is a mobile phone smart card that can realize short-range wireless communication. It is a full-service platform that can replace wallets, keys and ID cards. It can realize multiple applications of one card, including electronic wallets. , Analog IC card applications and analog ID card applications. The data in the above applications are all stored in the non-volatile memory of the MCU (Micro Controller Unit) in the RF smart card. When the application data needs to be changed, the non-volatile memory needs to be erased and written, that is, erase first and then write The way. Generally, the erase operation does not support byte operations, and mostly uses page-by-page operations, and a page is 512 bytes or 1024 bytes. It t...

AI Technical Summary

Problems solved by technology

However, the above-mentioned traditional method has to go through multiple erasing steps, which will increase the time for swiping the card a lot on the one hand, and on the other hand, if there is an abnormality in one step of the whole process, the swiping card will be regarded as a failure, which may even lead to the application of the radio frequency smart card. data corruption

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