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A method, terminal device and storage medium for extracting deleted file fragments

A technology of file fragmentation and deletion, which is applied in the direction of file system, file system function, hardware redundancy for data error detection, etc. It can solve the problem of limited data and achieve the effect of enriching ideas

Active Publication Date: 2021-11-19
XIAMEN MEIYA PICO INFORMATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the space allocation, overwriting and recycling mechanism of the SQLite database, the data we can generally recover is relatively limited

Method used

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  • A method, terminal device and storage medium for extracting deleted file fragments
  • A method, terminal device and storage medium for extracting deleted file fragments
  • A method, terminal device and storage medium for extracting deleted file fragments

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Embodiment 1 of the present invention provides a method for extracting deleted file fragments, such as figure 1 As shown, it is a schematic flow chart of the method for extracting deleted file fragments described in Embodiment 1 of the present invention, and the method may include the following steps:

[0039] S100: Obtain an image file of the mobile terminal.

[0040] The mobile terminal described in this embodiment is a mobile phone, and the acquisition method includes directly connecting the mobile phone or extracting the image file of the mobile phone from the chip. If the direct connection method of the mobile phone is used, ensure that the extracted image file includes complete user data area, if you use the chip extraction method, it is preferable to use the full disk extraction.

[0041] S200: Locate the user data area in the image file.

[0042] The positioning method of the user data area in this embodiment is to locate the user data area through the partiti...

Embodiment 2

[0071] The present invention also provides a terminal device for extracting deleted file fragments, including a memory, a processor, and a computer program stored in the memory and operable on the processor, when the processor executes the computer program The steps in the above method embodiment of Embodiment 1 of the present invention are realized.

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Abstract

The present invention relates to a method for extracting deleted file fragments, a terminal device and a storage medium. In the method, the following steps are included: S100: obtaining a mirror image file of a mobile terminal; S200: locating a user data area in the mirror file; S300: Extract the unused space of the file system in the user data area, and set the size of the unused space to K; S400: take the logical block size Z as the unit, traverse the unused space of the file system in the user data area, and extract all plaintext and ciphertext data , the application plaintext can be directly used as a source fragment for SQLite record analysis, and the ciphertext needs to be decrypted; S500: Decrypt the extracted ciphertext. The present invention traverses the unused space of the user data area of ​​the image file and matches the characteristic data of the application to extract all plaintext and ciphertext fragments, and deciphers the ciphertext fragments to restore SQLITE file fragments.

Description

technical field [0001] The invention relates to the field of computer file systems, in particular to a method for extracting deleted file fragments, a terminal device and a storage medium. Background technique [0002] Data recovery refers to the technology of rescuing and recovering electronic data lost on desktop hard disks, notebook hard disks, server hard disks, storage tape libraries, mobile hard disks, U disks, digital memory cards, Mp3 and other devices through technical means. . [0003] At present, in the field of mobile terminals, there is a wide demand for deletion, uninstallation and recovery of applications. The deletion and uninstallation recovery of most applications is based on the recovery of the SQLite database. Due to the space allocation, overwriting and recycling mechanism of the SQLite database, the data we can generally recover is relatively limited. Especially for some applications such as WeChat, due to the use of the secure deletion mechanism, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F11/14G06F11/20G06F16/17
CPCG06F11/1448G06F11/2056G06F16/1724
Inventor 李永兴陈明辉张辉极
Owner XIAMEN MEIYA PICO INFORMATION