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File storage method and safe deletion method of encryption card

A file storage and file deletion technology, applied in the field of file storage method and secure deletion of encrypted cards, can solve problems such as low efficiency and damage to memory life, and achieve the effects of improving efficiency, reducing wear rate, and reducing the number of erasing and writing.

Inactive Publication Date: 2017-05-31
AEROSPACE INFORMATION
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Problems solved by technology

This will be inefficient and will greatly damage the life of the memory

Method used

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  • File storage method and safe deletion method of encryption card
  • File storage method and safe deletion method of encryption card
  • File storage method and safe deletion method of encryption card

Examples

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Embodiment Construction

[0026] In order to facilitate the understanding of the embodiments of the present invention, several specific embodiments will be taken as examples for further explanation below in conjunction with the accompanying drawings, and each embodiment does not constitute a limitation to the embodiments of the present invention.

[0027] Based on the characteristics of NAND Flash and NOR Flash, before describing the safe deletion of encrypted card information, the storage method used in the present invention is first described. According to the characteristics of NAND Flash and NOR Flash, the storage methods of encryption cards are functionally divided.

[0028] A file storage method of an encryption card, wherein the encryption card includes NOR Flash and NAND Flash, and the storage method includes:

[0029] Store large-capacity sensitive information in NAND Flash; store auxiliary NAND Flash management information in NOR Flash. Wherein, the auxiliary NAND Flash management informatio...

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Abstract

The invention relates to the field of flash memory and provides a file storage method of an encryption card. The encryption card comprises NOR Flash and NAND Flash. The storage method comprises steps as follows: large-volume sensitive information is stored in the NAND Flash; auxiliary NAND Flash management information comprising a key corresponding to a file stored in the NAND Flash is stored in the NOR Flash. The safe storage method is realized on an existing encryption card platform, modification of the hardware structure of the existing encryption card is not required, an interface of the existing encryption card can be used, the characteristics of the NAND Flash and the NOR Flash are fully used, the frequency of NAND Flash erasing is greatly reduced, and the wear rate is decreased while the efficiency is improved.

Description

technical field [0001] The invention relates to the field of flash memory, in particular to an encryption card file storage method and a safe deletion method. Background technique [0002] Flash memory includes NAND Flash and NOR Flash, which is a non-volatile storage area whose information will not be lost after power failure. NOR Flash has a small capacity, slow erasing, and a lifespan of about 100,000 times. The advantage is that it can realize XIP (eXecute InPlace, in-chip execution). However, NAND Flash has large capacity, low cost, and fast reading. It is used more and more in large-capacity storage. The disadvantage is that as the cost decreases and the capacity increases, the life span is reduced from the initial SLC life of about 100,000 times to The 10,000-time life of MLC, the current TLC life is even only a few thousand times. [0003] In encrypted cards, NOR Flash is generally used to store sensitive information such as keys and certificates. However, with the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/06G06F21/62
CPCG06F3/0622G06F3/0644G06F3/0652G06F3/0679G06F21/6218
Inventor 杨硕王申
Owner AEROSPACE INFORMATION
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