WO2008007533A1 - Procédé d'effacement de données et programme d'effacement de données - Google Patents

Procédé d'effacement de données et programme d'effacement de données Download PDF

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Publication number
WO2008007533A1
WO2008007533A1 PCT/JP2007/062706 JP2007062706W WO2008007533A1 WO 2008007533 A1 WO2008007533 A1 WO 2008007533A1 JP 2007062706 W JP2007062706 W JP 2007062706W WO 2008007533 A1 WO2008007533 A1 WO 2008007533A1
Authority
WO
WIPO (PCT)
Prior art keywords
file
data
size
program
deletion
Prior art date
Application number
PCT/JP2007/062706
Other languages
English (en)
Japanese (ja)
Inventor
Akiyoshi Okamoto
Original Assignee
Japan Wave. Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Japan Wave. Inc. filed Critical Japan Wave. Inc.
Publication of WO2008007533A1 publication Critical patent/WO2008007533A1/fr

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/10—File systems; File servers
    • G06F16/16—File or folder operations, e.g. details of user interfaces specifically adapted to file systems
    • G06F16/162—Delete operations

Definitions

  • the present invention relates to a data deletion method and a data deletion program for deleting data recorded in units of files in a recording device such as a hard disk of a personal computer.
  • Patent Document 1 Japanese Patent Laid-Open No. 2003-030801
  • the present invention has been made in view of the above circumstances, and the object of the present invention is to be able to delete data in a short time without imposing a burden on the CPU of the computer. Is to provide a data deletion method and a data deletion program. Means for solving the problem
  • the data deletion method of the present invention specifies file management information corresponding to a file of data to be deleted, and deletes the file management information to thereby delete the data file.
  • This is a method for deleting data on a file system, and before deleting the file management information, rewrites the file size information included in the specified file management information, thereby changing the file size of the file. It is characterized by having a variable step.
  • the file size variable step it is preferable to rewrite the file size information so that the file size of the file is smaller than the original size.
  • the data deletion method may further include an overwriting step of overwriting a random number with respect to the file data before performing the file size variable step.
  • the file management information of the file of the data to be deleted is specified, the file size information included in the file management information is rewritten, and thereby the file size of the file is variable. After that, the file is deleted on the file system. For this reason, even if the computer recovers the data recovery program and restores the file deleted on the file system, the file with a variable file size is read, and the data of the file is completely read. It becomes difficult to read. Since the file size variable processing for such a file only rewrites the file management information, it can be performed in a short time without imposing a heavy burden on the CPU or recording device of the computer that performs the processing.
  • the file size of the file is made smaller than the original size
  • the relationship between the difference data recorded in the reduced portion of the file and the file is the file system. Be deleted on the system.
  • the file can be made to appear as if it was originally reduced in size, so that even if the file is restored using a data restoration program, the difference data can be restored. Can be reduced. Therefore, if the size is reduced as much as possible, illegal reading of the data can be suitably prevented.
  • FIG. 1 is a block diagram of a computer in which a data deletion program according to an embodiment of the present invention is processed
  • FIG. 2 is a flowchart of the program
  • FIG. 3 is a process of changing the file size of the data file of the program. It is a schematic diagram shown.
  • a computer 10 shown in FIG. 1 is a general-purpose personal computer, and includes a control unit 11 such as a CPU, a recording device 12, an operation unit 13, a communication unit 14, and a read / write unit 15.
  • the operation unit 13 is connected to an input device such as a keyboard and a mouse.
  • the communication unit 14 is connected to a communication line such as the Internet.
  • the read / write unit 5 is a DVD drive or the like in which a recording medium such as a compact disk or a flash memory is set and data is read from and written to the recording medium.
  • the recording device 12 is a hard disk drive, in which basic programs such as a data deletion program shown in FIG. 2 and an operation program (not shown) processed by the control unit 11 are recorded in advance.
  • data d is recorded in units of files.
  • the file is referred to as a data file.
  • a recording device 12, an operation unit 13, a communication unit 14, and a read / write unit 15 are connected to the input port of the control unit 11.
  • a recording device 12, a communication unit 14 and a read / write unit 15 are connected to the output port of the control unit 11.
  • the control unit 11 functions as the computer 10 by processing the operation program.
  • the data file is a function of the operation program by the control unit 11. It is a file configured on the recording device 12 to manage (read / write and delete) data d by processing a file management program (file system).
  • file system the well-known FATFS (File Allocation
  • This data file has a data area in which data d is recorded and a management area in which file management information for managing data d is recorded.
  • the file management information includes information such as file name, extension, attribute, file size, update date and time, file start cluster number, and file end cluster number.
  • this data deletion program is processed by the control unit 11 when an instruction to delete data d is input.
  • the data deletion instruction includes an instruction input by an operation through an input device connected to the operation unit 13, or an instruction input by a data expiration management program (not shown) recorded in the recording device 12.
  • the data expiration management program refers to the date and time when the data d was recorded in the recording device 12 by referring to the timer unit of the computer 10 and recorded in the recording device 12, and the date and time on the recording device 12 and the current date and time.
  • a command for specifying a data file of data d instructed to be deleted is executed (sl). Then, the file system of the operation program is processed, the file management information of the data file is searched, and the data file is specified.
  • the file size variable processing can be performed in a short time without imposing a burden on the computer CPU or the recording device 12, so that the processing time of the data d deletion processing can be shortened. .
  • the data deletion program includes a step of specifying file management information of a file of data to be deleted, and deleting the data file on the file system by deleting the specified file management information.
  • the file size information is rewritten to "0" for the above file size variable processing.
  • the present invention is not limited to this, and the end cluster number of the file may be rewritten.
  • this variable file size step it is desirable to rewrite the file size information so that it is smaller than the original size.
  • data files with a structure in which data access information is written at the end of the file By rewriting the file size information so as to be larger than the original size, the same effect as described above can be obtained by making the position of the access information unknown.
  • deletion program In addition, other processing can be incorporated into the deletion program. For example, the contents of the data management program.
  • the input of the data d deletion instruction to the deletion program is not limited to the above-described one.
  • the deletion instruction may be input at a predetermined date and time, or the deletion instruction may be input from the outside of the computer 10 through the communication unit 14.
  • the recording device 12 it is possible to use a recording medium such as a compact disc, a DVD, a flash memory, or the like, which is not limited to what is built into the computer 10 as a hard disk drive! What! /
  • the file system described above is an example, and it goes without saying that it can also be realized by using a file system having the same function. Also, it does not matter if the deletion program and the file system are configured integrally. As for the deletion of data files on the file system, the deletion information is recorded in the file management information. However, the present invention is not limited to this, and the file management information may be overwritten to delete the information. I do not care.
  • any computer 10 can be used as long as it has a function capable of processing the deletion program.
  • FIG. 1 is a block diagram of a computer in which a data deletion program according to an embodiment of the present invention is processed.
  • FIG. 2 is a flowchart of the program.
  • FIG. 3 is a schematic diagram showing the process of variable file size processing of the data file of the program.

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Data Mining & Analysis (AREA)
  • Databases & Information Systems (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Information Retrieval, Db Structures And Fs Structures Therefor (AREA)
  • Storage Device Security (AREA)

Abstract

La présente invention concerne un procédé innovant d'effacement de données et un programme d'effacement de données permettant d'effacer des données rapidement sans appliquer de charge sur la CPU d'un ordinateur ou similaire. Le programme d'effacement de données comprend : une étape consistant à identifier un fichier de données d à effacer ; une étape consistant à écraser un nombre aléatoire de plusieurs positions arbitraires dans les données d ; une étape consistant à réécrire les informations de taille de fichier contenues dans les informations de gestion du fichier sur le fichier de données d à '0' afin de modifier la taille du fichier de données ; et une étape consistant à enregistrer les informations d'effacement dans les informations de gestion de fichier sur le fichier de données d et à effacer le fichier de données du système de fichiers.
PCT/JP2007/062706 2006-06-23 2007-06-25 Procédé d'effacement de données et programme d'effacement de données WO2008007533A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006-173541 2006-06-23
JP2006173541A JP2008003892A (ja) 2006-06-23 2006-06-23 データの削除方法及びデータの削除プログラム

Publications (1)

Publication Number Publication Date
WO2008007533A1 true WO2008007533A1 (fr) 2008-01-17

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2007/062706 WO2008007533A1 (fr) 2006-06-23 2007-06-25 Procédé d'effacement de données et programme d'effacement de données

Country Status (2)

Country Link
JP (1) JP2008003892A (fr)
WO (1) WO2008007533A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8407401B2 (en) 2008-11-26 2013-03-26 Core Wireless Licensing S.A.R.L. Methods, apparatuses, and computer program products for enhancing memory erase functionality

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10214217A (ja) * 1997-01-29 1998-08-11 Sharp Corp ネットワークキャッシュ装置およびネットワークキャッシュ方法
JP2004118322A (ja) * 2002-09-24 2004-04-15 Tomoaki Ito ファイル情報管理装置
JP2004126909A (ja) * 2002-10-02 2004-04-22 Panasonic Communications Co Ltd ファイル管理装置及びファイル削除方法、並びに文書処理装置、記録装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10214217A (ja) * 1997-01-29 1998-08-11 Sharp Corp ネットワークキャッシュ装置およびネットワークキャッシュ方法
JP2004118322A (ja) * 2002-09-24 2004-04-15 Tomoaki Ito ファイル情報管理装置
JP2004126909A (ja) * 2002-10-02 2004-04-22 Panasonic Communications Co Ltd ファイル管理装置及びファイル削除方法、並びに文書処理装置、記録装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Hard Disk Tankentai ga Iku, Shirei 3 Kieta Data no Fukkyu no Kanosei o Sagure Sosa Miss ni Sugu Kizukeba Data wa Modottekuru", NIKKEI PERSONAL COMPUTING, NIKKEI BUSINESS PUBLICATIONS, INC., 5 July 2004 (2004-07-05), pages 84 - 86, XP003024709 *

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