IP Library Granted Patent US 9,858,435
Granted Patent B2
US 9,858,435 · App. 14/781,977 · Granted Jan 2, 2018

Method of destroying file contents

Inventor: Thorsten Höhnke (Königsbrunn, DE)
Assignee: Fujitsu Technology Solutions Intellectual Property GmbH
G06F21/6245G06F17/30085G06F17/30117G06F21/10G06F21/629G06F2221/2143
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Quick Facts
Patent No.
US 9,858,435
App. No.
14/781,977
Granted
Jan 2, 2018
Kind
B2
Abstract

A method of destroying file contents of a file includes storing the file in a predefined file format; integrating an algorithm that destroys file contents and has predefined trigger criteria into the file; checking the predefined trigger criteria when the file is opened; destroying file contents if at least one predefined trigger criterion is satisfied; and modifying the integrated algorithm if the predefined trigger criteria are not satisfied, wherein a first part of the algorithm is integrated into a first part of the file called by an executing program or an executing operating system when the file is opened, and modifying of the integrated algorithm includes modifying the storage structure of the algorithm so that it occurs in changed form after the opening of the file and cannot be recognized as before.

Claims (11)

1. A method of destroying file contents of a file comprising:

storing the file in a predefined file format;

integrating an algorithm that destroys file contents and has predefined trigger criteria into the file;

checking the predefined trigger criteria when the file is opened;

destroying file contents if at least one predefined trigger criterion is satisfied; and

modifying the integrated algorithm if the predefined trigger criteria are not satisfied,

wherein the integrated algorithm completely prevents an opening of the file, if the file is stored on a non-writeable medium, so that the file cannot be modified.

2. The method according to claim 1 , wherein the predefined trigger criteria comprise a checking of one or more of the following parameters: date; time zone; regional data; make of a device on which the file is opened; serial number of a device on which the file is opened; time after opening the file; identifier of a user of a device on which the file is opened.

3. The method according to claim 1 , wherein a first part of the algorithm is integrated into a first part of the file which is called by an executing program when the file is opened.

4. The method according to claim 1 , wherein a first part of the algorithm is integrated into a first part of the file which is called by an executing operating system when the file is opened.

5. The method according to claim 1 , wherein a second part of the algorithm is integrated into a second part of the file and can be called by the first part of the algorithm.

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Feb 24, 2023
From: FUJITSU TECHNOLOGY SOLUTIONS INTELLECTUAL PROPERTY GMBH
To: FUJITSU TECHNOLOGY SOLUTIONS GMBH
Reel/Frame 062798/0755 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 26, 2015
From: HÖHNKE, THORSTEN
To: FUJITSU TECHNOLOGY SOLUTIONS INTELLECTUAL PROPERTY GMBH
Reel/Frame 036878/0624 →
Priority Claims (1)
DE 10 2014 105 116 · Apr 10, 2014 · national
Continuity (1)
Related Publication 20170024580A1 · Jan 26, 2017