A data backup method and device, and a data recovery method and device

Abstract

The present invention provides a data backup method and device, and a data recovery method and device. The data backup method is applied to a security chip, and the data backup method includes: obtaining the data to be backed up; taking the area storing the data to be backed up in the user area as the target area; erase the backup area; the backup area includes a backup flag, a reserved flag, and a data area; store the data to be backed up, the starting address of the target area, and the data length of the data to be backed up to the backup area the data area; setting the values ​​of the backup flag bit and the reserved flag bit in the backup area to the preset first valid value and the second valid value respectively. By applying the embodiment of the present invention, the reliability and security of data backup are improved.

Description

technical field [0001] The invention relates to the field of power failure protection, in particular to a data backup method and device, and a data recovery method and device. Background technique [0002] For products related to security chips, such as smart cards, secure elements (Secure Element, referred to as SE), microcontroller units (Microcontroller Unit, MCU), non-volatile memory (such as EEPROM, FLAHS), POS (pointof sale, sales terminal) Terminals, etc., in self-service places such as shopping malls or buses, etc., use card readers. In the process of operating the security chip, there is a risk of directly powering off the security chip during use. Therefore, the security chip is prone to repeated power failures. For example, in the process of swiping a card with a POS terminal, swiping a bus with a bus card, or swiping a contactless card, due to unstable field strength or unstable user holding the card, the card will repeatedly lose power during the transaction. ...

AI Technical Summary

Problems solved by technology

However, if there is a power failure during the backup process, the security chip may not be able to determine whether the data to be backed up has been successfully backed up, resulting in problems such as the product cannot continue to be used, so the security and reliability are not high, and for this type of security chip As far as the products are concerned, security is an extremely important evaluation index, so it is necessary to design a new data backup method to overcome the above problems

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