System and method for securely deleting file from user space on mobile terminal flash medium

Abstract

The invention discloses a system and method for securely deleting a file from a user space on a mobile terminal flash medium. The system comprises the user space and a kernel space, wherein the user space comprises an application program, a user space file system module, an encryption and decryption module, a key management module and a garbage recovery module; and the kernel space comprises a virtual file system module, a kernel driving module and a basic file system. According to the method, an application program operation file function is transmitted to a virtual file system module; a virtual file system function is routed to a user space file system; the user space file system encrypts and decrypts an operation file; the encryption and decryption module calls a key management module to obtain a key; and a basic file system method is called for completing the file operation of the application program on the user space file system. The file is securely deleted in a file key deleting way; ciphertexts of the file key and file ciphertexts in the user space file system are thoroughly deleted from the flash medium in a garbage recovery way, so that the goal of securely detecting the file from the mobile terminal flash medium is realized.

Description

technical field [0001] The invention belongs to the field of data storage security of flash media of mobile terminals, and relates to a system and method for securely deleting files in user space on the flash media of mobile terminals. Background technique [0002] With the widespread popularity of mobile devices, mobile terminals store a large amount of personal sensitive information of users (such as emails, address books, account passwords, and text messages, etc.). If the mobile terminal is sold, lost, or stolen, it will cause the leakage of users' personal information. . Therefore, it becomes more important to protect the security of mobile terminal data. Existing mobile terminals, such as smartphones, tablet computers, e-readers, etc., mostly use flash memory media as memory, however, flash memory media is different from other storage media (especially disk media). In , the smallest physical operation unit is a bit. Flash media has special physical characteristics. ...

AI Technical Summary

Problems solved by technology

Therefore, the logically deleted files in the user's mobile terminal may be recovered through specific technical means

In addition, most of the current mobile terminals provide factory reset to format the flash storage of the mobile terminal. This method cannot completely delete the data in the storage. At the same time, because the entire storage area is formatted, it cannot provide fine-grained user files. safe delete

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