KR101707183B1 - Method and computer program for providing file deleting service - Google Patents

Abstract

According to the present embodiment, a request input unit receives a file deletion request to delete at least one file stored in the device from a user; A file deleting unit deleting a file included in the deletion request; And a file safe deleting unit for overwriting the deleted file with a dummy value in an area including the area where the file is stored so that the deleted file can not be recovered by the file deleting unit.

Description

METHOD AND COMPUTER PROGRAM FOR PROVIDING FILE DELETING SERVICE,

The present invention relates to an apparatus and method for providing a file safe deletion function and a computer program for executing the same on a computer, and more particularly, to an apparatus and a method for providing a file safe deletion function for securely deleting a file so that the file can not be recovered, To a computer program for carrying out the invention.

In order to guarantee portability and mobility, existing portable terminals were limited to calls only. However, in order to meet various needs of users, recently introduced portable terminal has various functions such as internet function, data storage function, image shooting function, etc. by mounting a short distance communication module, a USB port, a large capacity memory or a high- It is becoming a total multimedia device that can perform functions.

However, if the portable terminal used for storing user's private information and confidential data is lost, the user can easily restore the portable terminal even if the corresponding data is already deleted. In this case, the user's personal information and confidential information stored in the portable terminal are exposed to a third party and cause serious harm.

In addition, even if the user can not directly access the file system of the smartphone, deletes the file stored in the smartphone through the file management application, or deletes the stored application, the file is not completely deleted, There is a risk that stored data will be leaked.

Korean Patent Laid-Open Publication No. 2012-0118267

An object of the present invention is to provide a function of overwriting a physical storage area in which a file is stored in a dummy value when deleting a file.

It is another object of the present invention to provide a function of deleting a metadata area of a file when the file is deleted so as to be unrecoverable.

Another object of the present invention is to provide a function for changing a data included in a file to a dummy value before deleting the file, and deleting the deleted data so that the file can not be recovered.

A method for providing a file safe deletion function according to embodiments of the present invention includes: a request input step of receiving a file deletion request for deleting at least one file stored in a device from a user; A file deletion step of deleting a file included in the deletion request; A metadata deletion step of deleting the first file after generating a first file having the same name as the file name; A free space calculating step of calculating a free storage space size after deleting the file; And a file safe erasing step of overwriting the area including the area in which the file is stored so that the erased file can not be recovered, with a dummy value, wherein the file safely erasing step comprises: The second file can be deleted after the second file is created.

In the present embodiment, the file safe deleting step may delete the second file after generating the second file in the same directory as the directory in which the file is stored.

A method for providing a file safe deletion function according to embodiments of the present invention includes: a request input step of receiving a file deletion request for deleting at least one file stored in a device from a user; A file deletion step of deleting a file included in the deletion request; A metadata deletion step of deleting the first file after creating a first file having the same name or size as the file name; Creating a second file including a dummy value in the same directory as the directory in which the file is stored so that the deleted file can not be recovered, and deleting the second file.

A method for providing a file safe deletion function according to embodiments of the present invention includes: a request input step of receiving a file deletion request for deleting at least one file stored in a device from a user; A file deletion step of deleting a file included in the deletion request; A free space calculating step of calculating a free storage space size after deleting the file; And a file safe erasing step of overwriting the area including the area in which the file is stored so that the deleted file can not be recovered, with a dummy value, wherein the file safe erasing step comprises: A second file having a size in the same directory as the directory in which the file is stored, and then delete the second file.

The method for providing a file safe deletion function according to embodiments of the present invention may further include deleting all data included in the file before the file deletion step or storing a dummy value in the file have.

In addition to this, another method for implementing the present invention, another system, and a computer-readable recording medium for recording a computer program for executing the method are further provided.

Other aspects, features, and advantages other than those described above will become apparent from the following drawings, claims, and the detailed description of the invention.

According to the present invention, when deleting a file, it is possible to provide a function of overwriting a physical storage area in which the file is stored, with a dummy value.

According to another aspect of the present invention, there is provided a method for deleting a file, the method comprising:

In addition, according to the present invention, it is possible to provide a function of changing a data included in a file to a dummy value before deleting the file, and deleting the data, thereby making it impossible to recover the file.

1 is a block diagram illustrating a system for providing a file safe deletion function according to an embodiment of the present invention.
2 is a block diagram illustrating an apparatus 200 for providing a file safe deletion function according to an embodiment of the present invention.
3 to 6 are flowcharts for explaining the operation of the apparatus 200 for providing a file safe deletion function according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. The effects and features of the present invention and methods of achieving them will be apparent with reference to the embodiments described in detail below with reference to the drawings. However, the present invention is not limited to the embodiments described below, but may be implemented in various forms.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like or corresponding components throughout the drawings, and a duplicate description thereof will be omitted .

In the following embodiments, the terms first, second, and the like are used for the purpose of distinguishing one element from another element, not the limitative meaning.

In the following examples, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.

In the following embodiments, terms such as inclusive or possessed mean that a feature or element described in the specification is present, and does not exclude the possibility that one or more other features or components are added in advance.

If certain embodiments are otherwise feasible, the particular process sequence may be performed differently from the sequence described. For example, two processes that are described in succession may be performed substantially concurrently, and may be performed in the reverse order of the order described.

Here, the physical storage area refers to a portion where data in a storage device such as a hard disk drive, a floppy disk, and a ROM is actually stored. Usually, the physical storage area is accessed by the address assigned to each area.

1 is a block diagram illustrating a system for providing a file safe deletion function according to an embodiment of the present invention.

Referring to FIG. 1, a file safe deletion function providing apparatus 200 and a distribution server 100 are connected to a communication network 300 in a file safe deletion function providing system 10 of the present invention.

The file safe deletion function providing device 200 may completely delete the file in the storage space in order to delete the file selected in response to the file deletion request inputted by the user. Alternatively, the file safe deletion function providing device 200 may overwrite the area in which the file was stored in order to delete the stored file in a dummy value. Alternatively, the file safe deletion function providing device 200 may delete the file in a manner that the file can not be recovered by overwriting the area where the metadata of the file is stored, with the dummy value. The file safe deletion function providing apparatus 200 may delete the file included in the file to be deleted with a dummy value before deletion and delete the file so that the file can not be recovered.

Here, the file safe erasure function providing apparatus 200 may correspond to at least one processor or may include at least one or more processors. Accordingly, the file safe delete function providing apparatus 200 can be implemented in a form included in another hardware device such as a microprocessor or a general purpose computer system. For example, the file safe deletion function providing apparatus 200 may be installed in a terminal equipped with a display unit capable of displaying a screen.

The file safe deletion function providing device 200 may be mounted on a terminal having a file system or a terminal on which a file system is automatically mounted while booting. Here, a mount refers to a task of connecting a device and a directory to use a specific device as a specific directory, and may include an operation to connect to a directory of a file system. There is also an operating system in which a file system is automatically mounted while booting, but there is also an operating system in which a file system is manually mounted after booting the system, such as Linux, by using an operation system. (200) can be applied to an operating system without limitation.

To facilitate understanding of the present invention, a file system indicating a system for storing or organizing files or data in a computer for easy discovery and access will be described in more detail. The file system manages the physical location of the files by using physical data storage devices such as hard disk, floppy disk, ROM, CD-ROM, etc., and is used as data on the file server through clients that perform network protocols (NFS, SMB, 9P etc.) And a method in which only an access means exists as a virtual form. A file system is a collection of files, directories, structures or systems necessary for positioning and accessing, which collectively maintains file naming, storage, and organization, and is stored in a physical or logical storage device such as a disk or a diskette It can contain a collection of files and file management structures, and can be part of an operating system that handles file systems.

Operations such as creation, deletion, and modification of files and directories on a computer can be managed through metadata among file systems. The file system can access the physical storage area in which files, directories, and the like are actually stored using the data stored in the metadata. Here, the metadata refers to data including the actual name of the file, the storage start address, and the size of the file.

When a file stored in a hard disk or a removable storage device (for example, USB memory, etc.) is deleted by the file system, the file system does not delete the file from the physical storage area where the file is actually stored, Only the meta data such as the start address of the storage area and the size of the file are deleted. The structure of the files and directories stored on the hard disk is created based on the metadata of the file system, and the files that do not exist in the metadata are the same as those deleted.

The distribution server 100 can distribute the application code including the file safe deletion function to the file safe deletion function providing device 200. [

Meanwhile, the network 300 plays a role of connecting one or more file safe deletion function providing apparatus 200 and the distribution server 100. That is, the network 300 provides a connection path so that the file safe deletion function providing apparatus 200 can send and receive data after connecting to the distribution server 100.

2 is a block diagram illustrating an apparatus 200 for providing a file safe deletion function according to an embodiment of the present invention. 2, an apparatus 200 for providing a file safe deletion function includes a control unit 210, a user interface unit 220, a request input unit 240, a file deletion unit 241, a file safety deletion unit 242, A data deletion unit 243, a file content change unit 244, a spare space calculation unit 245, and a communication unit 230. [

The control unit 210 displays a screen on the user interface unit 220 and receives various commands or operations from the user through the screen.

The user interface unit 220 receives an input signal from a user and outputs an output signal to a user. The user interface unit 220 may include a keyboard, a mouse, a monitor, an imaging unit, and a sound input unit. The user interface unit 220 may be a touch screen of a tablet personal computer or the like.

The communication unit 230 connects the distribution server 100 and the file safe deletion function providing apparatus 200 through a communication network and performs a data transmission / reception function between them.

The request input unit 240 receives a file deletion request from the user through the user interface unit 220. Here, the file deletion request is a request to delete at least one file among the stored files, and may include a file name that is information indicating a file to be deleted, a directory where the file is stored, and the like. A screen configuration in which a file deletion request can be received can be generated and provided by the control unit 210.

The file deletion unit 241 deletes the file corresponding to the file information included in the file deletion request. Here, the file deletion unit 241 deletes the file through the file system. In the case of the file deleted by the file system as described above, the metadata of the file is deleted, but the physical storage area The file may not be deleted.

The file safe deleting unit 242 deletes the file from the physical storage area where the file was stored so that the deleted file can not be recovered. The file safe deleting unit 242 deletes the file by overwriting the physical storage area in which the deleted file was stored with the dummy value.

In another embodiment, the apparatus for providing a file safe deletion function 200 generates a first file having a size calculated on the basis of the size of a file deleted by the file deletion unit 241, And a metadata deletion unit 243 for deleting the metadata. When the first file having the same size as the deleted file is generated, the metadata of the first file can be created in the same area as the area in which the metadata of the deleted file is stored by the file system. That is, the physical storage area where the metadata of the deleted file is stored by the generated metadata of the first file is filled with the metadata of the first file. With this configuration, the file safe deleting unit 242 changes the contents of the metadata so that the information (location and address information) about the physical storage area in which the deleted file is stored is not recovered through the metadata. As a result, The deleted file can not be restored because the physical storage area where the file was stored can not be retrieved. In another embodiment, the physical storage area where the metadata of the deleted file was stored may be partially overwritten with the metadata of the first file generated.

In yet another embodiment, the apparatus 200 for providing the file safe deletion function may further include a spare space calculating unit 245 for calculating the size of the free space of the storage space. The file safe deleting unit 242 creates a second file having a size of the free space calculated on the basis of the size of the free space calculated through the free space calculating unit 245 and then deletes the generated second file . In addition, the file safe deleting unit 242 creates and deletes a large-capacity file so as to occupy most of the free space, thereby overwriting an area in which the file does not exist with a dummy value. For example, if a second file having a size of 90% of the free space is generated, the physical storage area in which the deleted file is stored is already included in the free space. Therefore, And the second file may be stored in the storage area. That is, the physical storage area where the deleted file is stored is overwritten with the second file. Even if the metadata of the deleted file is recovered and the physical storage location of the deleted file is recovered through such a configuration, since the data is already overwritten with another value, the original data contents of the deleted file can not be recovered.

In another embodiment, the file safe deletion function providing device 200 deletes all the data included in the file corresponding to the file information included in the file deletion request, or deletes the file content And may further include a change unit 244. The file safe deletion function providing device 200 can overwrite the data included in the file with the dummy value through the file content changing unit 244 and delete the file through the file deleting unit 241. [ If the data contained in the file is changed by the dummy value, even if the file is restored, since the original data of the file is changed and deleted, the value stored in the file can be recovered, but the original stored original data can not be recovered .

In another embodiment, the file safe deleting unit 242 may store a third file having a dummy value content in the same directory as the directory in which the file corresponding to the file information included in the file delete request is stored. Since the file stored in the same directory is stored in the physical storage area close to the file deleted by the file system, the physical storage area of the deleted file can be overwritten with the third file, so that the deleted file can not be recovered Can be completely deleted.

3 to 6 are flowcharts for explaining the operation of the apparatus 200 for providing a file safe deletion function according to an embodiment of the present invention.

Referring to FIG. 3, the apparatus 200 for providing a file safe deletion function may include a delete request input step S110, a file delete step S120, and a file safe delete step S130.

In S110, the file safe deletion function providing device 200 receives a file deletion request from the user.

In S120, the file safe deletion function providing apparatus 200 deletes the file corresponding to the file information included in the file deletion request.

The file safe deletion function providing apparatus 200 deletes the file in the physical storage area in which the file was stored so that the deleted file can not be recovered. At this time, the file safe deletion function providing device 200 can delete the file by making it impossible to recover the file by overwriting the physical storage area in which the deleted file was stored with the dummy value.

Referring to FIG. 4, the apparatus 200 for providing a file safe deletion function may include a deletion request input step S210, a file deletion step S220, and a metadata deletion step S230.

S210 and S220 are the same as S110 and S120, and a detailed description thereof will be omitted.

In S230, the file safe deletion function providing apparatus 200 deletes the first file after generating a first file having a size calculated based on the size of the deleted file. When the first file having the same size as the deleted file is generated, the metadata of the first file can be created in the same area as the area in which the metadata of the deleted file is stored by the file system. That is, the physical storage area where the metadata of the deleted file is stored is filled with the metadata of the first file by the generated metadata of the first file.

Referring to FIG. 5, the apparatus 200 for providing a file safe deletion function includes a deletion request input step S310, a file content modification step S320, a file deletion step S330, and a file safe deletion step S340. can do.

S310, S330, and S340 are the same as S110, S120, and S130, and detailed description is omitted.

In S330, the file safe deletion function providing device 200 may delete all the data included in the file corresponding to the file information included in the file deletion request, or overwrite the data included in the file with the dummy value. The file safe deletion function providing device 200 can overwrite the data included in the file with another value and then delete the file.

In another embodiment, the file safe delete function providing apparatus 200 can perform the file delete operation without the file safe delete step 340. [

6, the apparatus 200 for providing a file safe deletion function includes a deletion request input step S410, a file deletion step S420, a free space calculation step S430, and a file safe deletion step S440. can do.

S410, S420, and S440 are the same as S110, S120, and S130, and a detailed description thereof will be omitted.

In S430, the file safe deletion function providing device 200 calculates the size of the free space in the storage space. The file safe deletion function providing apparatus 200 may generate a second file having a size calculated based on the size of the calculated free space and then delete the generated second file. For example, if a second file having a size of 90% of the free space is generated, the physical storage area in which the deleted file is stored is already included in the free space. Therefore, And the second file may be stored in the storage area. That is, the physical storage area where the deleted file is stored is overwritten with the second file. Even if the metadata of the deleted file is recovered and the physical storage location of the deleted file is recovered through such a configuration, since the data is already overwritten with another value, the original data contents of the deleted file can not be recovered.

The files and metadata deletion related steps (S120, S220, S230, S330, S340, S420, S440) described above may be repeated two or more times. Accordingly, the method for providing the file safe erasure function according to the embodiment of the present invention can delete the file irrecoverably.

The embodiments of the present invention described above can be embodied in the form of a computer program that can be executed on various components on a computer, and the computer program can be recorded on a computer-readable medium. At this time, the medium may be a magnetic medium such as a hard disk, a floppy disk and a magnetic tape, an optical recording medium such as CD-ROM and DVD, a magneto-optical medium such as a floptical disk, , A RAM, a flash memory, and the like, which are specifically configured to store and execute program instructions.

Meanwhile, the computer program may be designed and configured specifically for the present invention or may be known and used by those skilled in the computer software field. Examples of computer programs may include machine language code such as those produced by a compiler, as well as high-level language code that may be executed by a computer using an interpreter or the like.

The specific acts described in the present invention are, by way of example, not intended to limit the scope of the invention in any way. For brevity of description, descriptions of conventional electronic configurations, control systems, software, and other functional aspects of such systems may be omitted. Also, the connections or connecting members of the lines between the components shown in the figures are illustrative of functional connections and / or physical or circuit connections, which may be replaced or additionally provided by a variety of functional connections, physical Connection, or circuit connections. Also, unless stated otherwise such as " essential ", " importantly ", etc., it may not be a necessary component for application of the present invention.

The use of the terms " above " and similar indication words in the specification of the present invention (particularly in the claims) may refer to both singular and plural. In addition, in the present invention, when a range is described, it includes the invention to which the individual values belonging to the above range are applied (unless there is contradiction thereto), and each individual value constituting the above range is described in the detailed description of the invention The same. Finally, the steps may be performed in any suitable order, unless explicitly stated or contrary to the description of the steps constituting the method according to the invention. The present invention is not necessarily limited to the order of description of the above steps. The use of all examples or exemplary language (e.g., etc.) in this invention is for the purpose of describing the present invention only in detail and is not to be limited by the scope of the claims, It is not. It will also be appreciated by those skilled in the art that various modifications, combinations, and alterations may be made depending on design criteria and factors within the scope of the appended claims or equivalents thereof.

200: File Safe Delete function provided device
210:
220: user interface section
230:
240: Request input
241: File deletion unit
242: File safe deletion unit
243:
244: file content changing section
245: Free Space Calculator

Claims (6)

A request input step of receiving a file deletion request to delete at least one file stored in the device from a user;
A file deletion step of deleting a file included in the deletion request;
A metadata deletion step of deleting the first file after generating a first file having the same name as the file name;
A free space calculating step of calculating a free storage space size after deleting the file;
And a file safe erasing step of overwriting an area including the area where the file is stored with a dummy value so that the deleted file can not be recovered,
The file safe deleting step
Generating a second file having a size calculated based on the size of the spare storage space, and then deleting the second file.
The method according to claim 1,
The file safe deleting step
Generating the second file in the same directory as the directory in which the file is stored, and then deleting the second file.
A request input step of receiving a file deletion request to delete at least one file stored in the device from a user;
A file deletion step of deleting a file included in the deletion request;
A metadata deletion step of deleting the first file after creating a first file having the same name or size as the file name;
Creating a second file including a dummy value in the same directory as the directory in which the file is stored so that the deleted file can not be recovered and then deleting the second file;
A request input step of receiving a file deletion request to delete at least one file stored in the device from a user;
A file deletion step of deleting a file included in the deletion request;
A free space calculating step of calculating a free storage space size after deleting the file; And
And a file safe erasing step of overwriting an area including the area where the file is stored with a dummy value so that the deleted file can not be recovered,
The file safe deleting step
Generating a second file having a size calculated based on the size of the spare storage space in a directory same as the directory in which the file is stored, and then deleting the second file. 5. The method according to any one of claims 1 to 4,
And deleting all data included in the file before the file deletion step or storing a dummy value in the file. A computer program stored on a computer readable medium for executing a method according to any one of claims 1 to 4 using a computer.

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