Method for completely removing deleted jpg format in FAT 32 document system

A format file and file system technology, applied in the field of information security, can solve the problem of not being able to completely eliminate the data of FAT32jpg format files, and achieve the effect of preventing malicious theft and ensuring data privacy.

Active Publication Date: 2015-06-10
MWH TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the mainstream file system of SD cards on the market is FAT32, and the existing technology cannot completely clear the deleted jpg format file data in FAT32

Method used

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  • Method for completely removing deleted jpg format in FAT 32 document system
  • Method for completely removing deleted jpg format in FAT 32 document system
  • Method for completely removing deleted jpg format in FAT 32 document system

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Embodiment Construction

[0044] In order to describe the specific embodiment of the present invention in detail, below in conjunction with accompanying drawing description:

[0045] Such as figure 1 As shown, a method for completely clearing deleted jpg format files in the FAT32 file system includes the following steps:

[0046] S1: Obtain the target file system, obtain the directory entries of each layer of directories from the root directory layer by layer, analyze the directory entries to find all the directory entries of deleted jpg format files;

[0047] S2: According to the directory entry of the jpg file obtained in S1, analyze each directory entry and obtain the allocation area of ​​the jpg file;

[0048] S3: fill the allocation area of ​​each jpg format file acquired by S2 with a null value "0x00", so as to completely cover and clear the allocation area;

[0049] S4: Obtain the free area position of the target file system through the FAT table of the FAT32 file system;

[0050] S5: scan an...

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Abstract

The invention discloses a method for completely removing a deleted jpg format in a FAT 32 document system. The method comprises the following steps: S1: Searching all directory entries of the deleted jpg format document; S2: analyzing the directory entries and obtaining a distribution area of the jpg document; S3: writing in and filling empty value in the distribution zone; S4: obtaining a clear area position; S5: scanning and matching the clear area, and finding out fragment data; S6: writing in empty value and filling. Through a bottom layer, the method can analyze the deleted jpg document in the FAT 32 document system by, and find out the fragment data position of the deleted jpg document. The method ensures the safety of the normal jpg document while completely removes the jpg formatted document. Through the jpg document, the jpg document fragments in the clear area are removed for the second time, and thereby all fragment data are removed at the maximum degree, the public privacy is guaranteed, and malicious stealing behavior specific to private data is prevented.

Description

technical field [0001] The invention relates to the technical field of information security, in particular to a method for completely clearing deleted jpg format files in a FAT32 file system. Background technique [0002] In the FAT32 system, the jpg file data deleted by the user is not actually cleared from the storage medium, but the space for storing the jpg file is marked as free, and if other files are stored in this area, if the entire block is not completely covered Regions form fragmented jpg files. Due to the particularity that the partial damage of jpg format file data does not affect its partial display, the deleted jpg format file data can be easily recovered by some current data recovery software without being completely overwritten. There may be important data information that has not been deleted in the jpg format file, such as application information, geographic location information, photo shooting time information, photo shooting device information, etc. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/30
CPCG06F16/1724
Inventor 黄旭
Owner MWH TECH LLC
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