Wear-leveling power-down data protection method for smart card

Abstract

The invention belongs to the technical field of radio frequency electronic application, and particularly relates to a wear-leveling power-down data protection method for a smart card. Every time new current affair write data backup is opened, marked record items which are in a first backup mark zone and in a used backup state can be detected and skipped, then following detection continues to be conducted till the first marked record item which is in an available backup state currently is found, and the index value of the first marked record item is marked as i. In this way, the initial addressof the current affair write data backup is mapped to the next sector start of backup data, the situation is avoided that frequent erasing is conducted due to backup write, accordingly, the severe wear to a certain fixed sector is caused and the service life of the smart card is reduced, and the wear-leveling aim is achieved.

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

Images