JP2018022384A - Information processing apparatus, method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the possibility of information leakage easily without a user being aware of it.SOLUTION: An information processing apparatus includes: search means of searching and acquiring an object file which exists in a first layer where a file is likely to be leaked to the outside, on a hierarchical structure of an operating system, and corresponds to at least one of including a predetermined content and having a predetermined file format; collection means of moving the file to a second layer different from the first layer; encryption means of encrypting the object file included in the second layer to generate an encrypted file; and deletion means of deleting the encrypted file when the first period elapses.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an information processing apparatus, method, and program.

  With the recent expansion of communication networks, problems related to information leakage such as in-company information leakage due to computer viruses and the like frequently occur, and security measures against such information leakage are urgently needed.

  As a conventional technique related to data management, there is a method of deleting actual data and management information in accordance with the degree of confidentiality of data predetermined by a user (see, for example, Patent Document 1).

JP 2004-126909 A

  However, in the above method, the degree of confidentiality is determined by the user's judgment, so even if the user recognizes that the data is low confidentiality, the data is actually highly confidential. In this case, there is a possibility of information leakage because the data remains without being deleted.

  The present invention has been made in consideration of the above-described circumstances, and an object thereof is to provide an information processing apparatus, method, and program capable of easily reducing the possibility of information leakage without making the user aware of it. To do.

  In order to solve the above-described problem, the information processing apparatus according to the present embodiment is present in a specified hierarchy on the hierarchical structure in the operating system, includes a given content, and has a given file format. Search means for searching for and acquiring a target file corresponding to at least one, collection means for moving the target file to a hierarchy different from the specified hierarchy, and generating an encrypted file by encrypting the target file And an deleting unit that deletes the encrypted file after the first period has elapsed.

  According to the information processing apparatus, method, and program of the present invention, it is possible to easily reduce the possibility of information leakage without making the user aware of it.

The block diagram which shows the information processing apparatus which concerns on this embodiment. The figure which shows an example of the designation | designated method of an object file. 6 is a flowchart showing the operation of the information processing apparatus according to the embodiment. The figure which shows the usage example of the information processing apparatus which concerns on this embodiment.

  Hereinafter, an information processing apparatus, method, and program according to embodiments of the present invention will be described in detail with reference to the drawings. Note that, in the following embodiments, the same numbered portions are assumed to perform the same operation, and repeated description is omitted.

The information processing apparatus according to the present embodiment will be described with reference to FIG.
The information processing apparatus 100 according to the present embodiment includes a state detection unit 101, a search unit 102, a collection unit 103, an encryption unit 104, a deletion unit 105, and a timer unit 106.

  The state detection unit 101 detects the end of use of the operating system (OS) of the personal computer (PC). “End of use” indicates a time point when the user ends the work, for example, when the user is in a logoff state or when a so-called shutdown button is clicked or pressed. Therefore, not only in the log-off state and the shutdown state, but also when the instruction to execute the processing of the information processing apparatus 100 is input from the user may be the end of use. In addition, a state in which a so-called screen saver is activated without input from the user may be set as the end of use. Further, the time when the work report such as daily report, weekly report, or monthly report is transmitted to the outside may be set as the end of use, and can be set as appropriate by the administrator who manages the PC used by the user.

  The search unit 102 searches and acquires a target file in a storage area such as a hard disk drive (HDD) or a solid state drive (SDD) of a PC. The target file is at least one of existing in a specified hierarchy (also referred to as the first hierarchy) such as a folder or directory in the OS, including a given content, and being in a given file format. It is a file corresponding to one.

  The collection unit 103 receives the target file from the search unit 102 and moves the target file to a layer (also referred to as a second layer) different from the specified layer. The second hierarchy is desirably a hierarchy in which a normal user does not have authority to perform file operations (read, write, change, etc.) and only the administrator can perform file operations. Note that the second hierarchy may be a hierarchy in which a normal user cannot write, but is given only authority to view what kind of file exists.

  The encryption unit 104 encrypts the target file existing in the second hierarchy and generates an encrypted file. Since the encryption process may use a general encryption process such as a common key encryption system or a public key encryption system, detailed description thereof is omitted here.

  The deletion unit 105 activates the timer unit 106, receives a notification indicating that a predetermined period (also referred to as a first period) has elapsed from the timer unit 106, and then deletes the encrypted file.

  The timer unit 106 is a general timer, and starts a timer according to an instruction from the deletion unit 105 to measure the time. When the first period has elapsed, the timer unit 106 notifies the deletion unit 105 that the first period has elapsed. To do.

Next, an example of a method for specifying a target file will be described with reference to FIG.
As shown in the table 200 of FIG. 2, as a method for specifying a target file, it may be specified in a hierarchy given by a URL, a path (absolute path, relative path), or the like. A file existing in the specified hierarchy is the target file. The target file can be specified using a file format (file extension) such as “.zip”, “.docx”, or “.pptx”. For example, the keywords “confidential”, “ The method may be specified by a specific content included in a file such as “”. Here, the “content” is not limited to a character string described as the contents of a file, but includes additional information such as a character string of a file name and a time stamp of the file.
For example, even when “(external secret) customer list” is described in the file name instead of the contents of the file, it is designated as the target file. Further, for example, when it is desired to specify a target file under the condition “file created today”, the time stamp of the file may be referred to.

  Note that a plurality of these designation methods may be combined as the target file designation method. For example, a designation method may be used in which a file having an extension of “.docx” present in the hierarchy of the path “../\documents” is set as a target file.

  The table 200 may be held by the search unit 102 or may be stored in an external storage device so that the search unit 102 can refer to it during search processing.

Next, the operation of the information processing apparatus 100 will be described with reference to the flowchart of FIG.
In step S301, the state detection unit 101 determines whether or not the use end time has been detected. If the use end time is detected, the process proceeds to step S302. If the use end time is not detected, the process waits until the use end time is detected (repeating its own processing step S301).

  In step S302, the search unit 102 searches for a target file. In the target file search process, for example, when a hierarchy is specified by a URL or a path as a method of specifying the target file, a file existing in the specified hierarchy is acquired as the target file. When the target file is designated by an extension, a file with the same extension may be selected as the designated file. When the target file is specified by a keyword, the file content may be searched using a general character string search process, and a file including a matching keyword may be selected as the specified file.

  In step S303, the collection unit 103 moves the target file to the second hierarchy. For the moving process, a general file moving method (so-called cut and paste or the like) may be used. Further, a hidden attribute may be added to the moved target file to hide the existence of the target file from the user. The collection unit 103 may generate a movement completion notification indicating that the movement of the target file to the second hierarchy has been completed.

  In step S304, the encryption unit 104 receives the transfer completion notification from the encryption unit 104, performs an encryption process on the unencrypted file among the target files existing in the second layer, and generates an encrypted file. To do. A file size compression process may be performed in addition to the encryption process. In addition, the encryption unit 104 may generate an encryption completion notification indicating that the encryption is complete.

  In step S305, the timer unit 106 determines whether a predetermined period has elapsed. If the predetermined period has elapsed, the process proceeds to step S306. If the predetermined period has not yet elapsed, the process waits until the predetermined period elapses (repeats its own processing step S305). The trigger for starting activation of the timer unit 106 may be when the deletion unit 105 receives a completion instruction of the collection unit 103 or when an encryption completion notification of the encryption unit 104 is received.

  In step S306, the deletion unit 105 deletes the target file. Thus, the operation of the information processing apparatus 100 is finished.

Next, a usage example of the information processing apparatus according to the present embodiment will be described with reference to FIG.
The information processing apparatus according to the present embodiment may be realized so that the server 401 and the client 402 each include a partial configuration of the information processing apparatus. For example, the state detection unit 101 and the search unit 102 may be included in the client 402, and the collection unit 103, the encryption unit 104, the deletion unit 105, and the timer unit 106 may be included in the server. Of the server 401 or the client 402, the side that performs the encryption process is also called the own device, and the other side is also called the other device.

  The collection unit 103 on the server 401 side collects the target file acquired by the search unit 102 on the client 402 side, the encryption unit 104 encrypts the target file, and the deletion unit 105 deletes the target file. According to this process, the target file does not remain on the client 402, and the server 401 can encrypt and manage the target file at the time of information leakage, thereby greatly reducing the possibility of information leakage. Can do.

  Further, in the processing of step S305 and step S306 shown in FIG. 3, by waiting for a predetermined period until the target file is deleted, that is, by providing a grace period, when the user of the client 402 requests restoration of the target file, For example, it is possible to provide a rescue measure such that the encryption unit 104 or the decryption unit (not shown) can decrypt the encrypted file and return it to the user.

  This is because the file created by the user has been moved as the target file and has not existed on the PC at hand, but if the file is difficult for the user to create again, the user can This is a relief measure that assumes that the administrator decrypts the file and returns it to the user by requesting restoration.

For the decryption process, for example, the server 401 stores a part of the decryption key (also referred to as the first decryption key), the client 402 stores the remaining part of the decryption key (also referred to as the second decryption key), and the first decryption. The encrypted file may be decrypted using one or both of the key and the second decryption key. For example, the encrypted file may be decrypted using only the first decryption key stored in the client, or the decryption key necessary for the decryption process is generated using both the first decryption key and the second decryption key. Then, decryption processing of the encrypted file may be performed. Note that the decryption key may be held by the client or the server alone without dividing the decryption key, and the decryption process may be performed.
Also in the encryption, as in the decryption process, the encryption key is divided into two (first encryption key, second encryption key), and the first encryption key and the second encryption key You may perform an encryption process using one or both. The encryption key may be divided and managed by the server 401 and the client 402, or may be held by either the client or the server alone without performing the encryption process, and the encryption process may be performed.

  Further, if the client side has only an input unit such as a keyboard and a mouse and a display, and a processing apparatus such as an OS, an application, and a storage unit is in the server, the server 401 includes the information processing apparatus 100. It only has to be done. On the other hand, the information processing apparatus 100 may be included in the client 402, and only the activation instruction (trigger) for starting the operation of the information processing apparatus 100 may be given from the server 401.

  If the operation prohibition time zone for prohibiting the operation of the information processing apparatus 100 is set and the time when the state detection unit 101 detects the end of use is the operation prohibition time zone, the search processing in the search unit 102 is not performed. That is, the information processing apparatus 100 may not be operated.

Also, a priority may be provided for the target file designation method (or a combination of a plurality of designation methods), and the setting of the grace period until the target file is deleted may be changed according to the priority.
For example, the grace period may be set shorter because the urgency to delete the target file is higher as the priority is higher. The priority may be set in advance by the administrator for the method of specifying the target file.

  As specific processing, for example, when the target file is specified by a path in the table 200 shown in FIG. 2, the priority of the specified hierarchy “../Temporary” is maximized or specified when a plurality of specifying methods are combined. It is assumed that the target file including the keyword “confidential” among files with the extension “.docx” existing in the hierarchy “../\Desktop” has the highest priority. Further, when the priority is the maximum, it is assumed that the grace period measured by the timer unit 106 is set to zero.

When the search unit 102 detects the target file having the highest priority, the search unit 102 comes to the deletion unit 105. The deletion unit 105 receives the target file having the highest priority from the search unit 102 and activates the timer unit 106. However, since the set grace period is zero, the target file may be deleted immediately.
The deletion unit 105 may set a grace period to be measured by the timer unit 106 according to the priority, or the timer unit 106 may hold a plurality of grace periods according to the priority in advance.

  In the above-described embodiment, a file is mentioned as a target, but a folder (directory) can be similarly processed. For example, the target folder can be searched, encrypted, and deleted by the above-described information processing apparatus 100 using the folder having the specified keyword as the target folder, and the possibility of information leakage to the folder can be reduced. it can.

  According to the information processing apparatus according to the present embodiment described above, the target file existing in the specified hierarchy is searched, the target file is moved to a hierarchy different from the specified hierarchy, the target file is encrypted, and after a predetermined period has elapsed. delete. By doing this, for example, the file is not left in the hierarchy where there is a risk that the file will be transmitted to the outside due to the infection of a computer virus, and the level of security is improved because it is managed by encrypting in another hierarchy Can do. In addition, since the target file is automatically deleted without intentional deletion by the user, the possibility of information leakage can be greatly reduced without making the user aware of it. Further, it is possible to take a remedy such as returning the file to the user by decrypting the encrypted file moved from the designated hierarchy in response to a request from the user. That is, according to the information processing apparatus according to the present embodiment, it is possible to significantly reduce the risk of information leakage while ensuring user convenience.

The instructions shown in the processing procedure shown in the above-described embodiment can be executed based on a program that is software. The general-purpose computer system stores this program in advance and reads this program, so that the same effect as that obtained by the information processing apparatus described above can be obtained. The instructions described in the above-described embodiments are, as programs that can be executed by a computer, magnetic disks (flexible disks, hard disks, etc.), optical disks (CD-ROM, CD-R, CD-RW, DVD-ROM, DVD). ± R, DVD ± RW, Blu-ray (registered trademark) Disc, etc.), semiconductor memory, or a similar recording medium. As long as the recording medium is readable by the computer or the embedded system, the storage format may be any form. If the computer reads the program from the recording medium and causes the CPU to execute instructions described in the program based on the program, the same operation as the information processing apparatus of the above-described embodiment can be realized. Of course, when the computer acquires or reads the program, it may be acquired or read through a network.
Further, an OS running on a computer based on an instruction of a program installed in a computer or an embedded system from a recording medium, database management software, MW (middleware) such as a network, and the like for realizing this embodiment A part of the processing may be executed.

Furthermore, the recording medium in the present embodiment is not limited to a medium independent of a computer or an embedded system, but also includes a recording medium in which a program transmitted via a LAN, the Internet, or the like is downloaded and stored or temporarily stored.
Further, the number of recording media is not limited to one, and when the processing in this embodiment is executed from a plurality of media, it is included in the recording medium in this embodiment, and the configuration of the media may be any configuration.

The computer or the embedded system in the present embodiment is for executing each process in the present embodiment based on a program stored in a recording medium. The computer or the embedded system includes a single device such as a personal computer or a microcomputer. The system may be any configuration such as a system connected to the network.
In addition, the computer in this embodiment is not limited to a personal computer, but includes an arithmetic processing device, a microcomputer, and the like included in an information processing device, and is a generic term for devices and devices that can realize the functions in this embodiment by a program. ing.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 100 ... Information processing apparatus 101 ... State detection part 102 ... Search part 103 ... Collection part 104 ... Encryption part 105 ... Deletion part 106 ... Timer part 200 ... Table 401 ... Server 402 ... Client

In order to solve the above-described problem, the information processing apparatus according to the present embodiment exists in the first hierarchy where there is a risk that a file may leak to the outside in the hierarchical structure in the operating system, and includes given contents. a search unit to search and retrieve the target file corresponding to at least one of it is this toe and a given file format, collecting means for moving the target file to a different second layer and the first layer And encryption means for encrypting the target file included in the second hierarchy to generate an encrypted file; and deletion means for deleting the encrypted file after the first period has elapsed. And

The search unit 102 searches for and acquires a target file in a storage area such as a hard disk drive (HDD) or a solid state drive ( SSD ) of a PC. The target file is at least one of existing in a specified hierarchy (also referred to as the first hierarchy) such as a folder or directory in the OS, including a given content, and being in a given file format. It is a file corresponding to one.

Further, in the processing of step S305 and step S306 shown in FIG. 3, by waiting for a predetermined period until the target file is deleted, that is, by providing a grace period, when the user of the client 402 requests restoration of the target file, For example, it is possible to take a remedy such that the encryption unit 104 or the decryption unit (not shown) can decrypt the encrypted file and return it to the user.

Claims (6)

Retrieval means for retrieving and acquiring a target file corresponding to at least one of existing in a specified hierarchy on a hierarchical structure in the operating system, including a given content, and being in a given file format When,
A collecting means for moving the target file to a hierarchy different from the designated hierarchy;
Encryption means for encrypting the target file to generate an encrypted file;
An information processing apparatus comprising: deletion means for deleting the encrypted file after the first period has elapsed. Further comprising state detection means for detecting when the use of the operating system ends.
The information processing apparatus according to claim 1, wherein the search unit starts searching for the target file when the state detection unit detects the end of use.   Using an encryption key that exists only in its own device or other device, or using one or both of a first encryption key existing in its own device and a second encryption key existing in the other device The information processing apparatus according to claim 1, wherein the target file is encrypted.   Using a decryption key that exists only in its own device or another device, or using one or both of a first decryption key existing in its own device and a second decryption key existing in the other device, The information processing apparatus according to any one of claims 1 to 3, wherein the encrypted file is decrypted. Search and obtain a target file corresponding to at least one of existing in a specified hierarchy on the hierarchical structure in the operating system, including a given content, and being in a given file format,
Moving the target file to a different hierarchy from the designated hierarchy;
Encrypt the target file to generate an encrypted file,
An information processing method, wherein the encrypted file is deleted after the first period. Computer
Retrieval means for retrieving and acquiring a target file corresponding to at least one of existing in a specified hierarchy on a hierarchical structure in the operating system, including a given content, and being in a given file format When,
A collecting means for moving the target file to a hierarchy different from the designated hierarchy;
Encryption means for encrypting the target file and generating an encrypted file;
An information processing program for functioning as deletion means for deleting the encrypted file after the first period has elapsed.