A smart card power-down data protection method with balanced wear

Abstract

The invention belongs to the technical field of radio frequency electronic applications, and in particular relates to a power-down data protection method for a smart card with balanced wear. The marked record item will continue to be detected until the first marked record item that is currently available for backup is found, and its index value is i, so that the starting address of the current transaction write data backup is mapped to the lower part of the backup data area. Start with one sector, avoid serious wear caused by frequent erasing of a fixed sector due to backup writing, and reduce the service life of the smart card, thus achieving the purpose of wear leveling.

Description

technical field [0001] The invention belongs to the technical field of radio frequency electronic applications, and in particular relates to a power-off data protection method for a smart card with balanced wear. Background technique [0002] With the development of microelectronics technology and semiconductor technology, the smart IC card that came out stands out from the traditional IC card with its overwhelming advantages and quickly penetrates into all walks of life in our lives, among which SIM cards, bank cards, municipal Cards, social security cards, access control cards and other forms of existence are the most common. As a high-security data carrier, smart cards often face data modification in applications. Due to the physical characteristics of its non-volatile memory, it needs to be erased before writing. Once the power is accidentally lost during the writing process, it may It will cause confusion and loss of data in the card, and even the card will be scrapped...

AI Technical Summary

Problems solved by technology

As a high-security data carrier, smart cards often face data modification in applications. Due to the physical characteristics of its non-volatile memory, it needs to be erased before writing. Once the power is accidentally lost during the writing process, it may It will cause confusion and loss of data in the card, and even the card will be scrapped in severe cases. Therefore, it is necessary to provide a backup-recovery means for the modified data in the smart card. In order to improve the service life of the smart card to a certain extent, it is necessary to find a method based on non-volatile memory to balance the wear and tear, and to further ensure the safety and reliability of the smart card during use from the software level

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