Outside leakage preventing system of confidential information

• US 7,114,081 B2
• Filed: 08/29/2002
• Issued: 09/26/2006
• Est. Priority Date: 10/03/2001
• Status: Expired due to Fees

• Current Assignee: GRAPHIN CO., LTD. (TECHNO HORIZON Co., Ltd.)
• Original Assignee: GRAPHIN CO., LTD. (TECHNO HORIZON Co., Ltd.)
• Inventors: Iwami, Kouzo, Watanabe, Kiyoshi, Miura, Masayuki
• Primary Examiner(s): Barrón, Jr., Gilberto
• Assistant Examiner(s): HERRING, VIRGIL A
• Application Number:
  US10/230,286
• Publication Number:
  US 20030065937A1
• Time in Patent Office: 1,489 Days
• Field of Search: None
• US Class Current: 713/189
• CPC Class Codes: G06F 21/6209 to a single file or object, e.g. in a secure envelope, encrypted and accessed using a key, or with access control rules appended to the object itself
• CPC Class Codes: G06F 2221/2137 Time limited access, e.g. to a computer or data
• CPC Class Codes: G09B 5/00 Electrically-operated educational appliances working with questions and answers G09B7/00; simulators G09B9/00; advertising or displaying in general G09F
• CPC Class Codes: G09B 7/00 Electrically-operated teaching apparatus or devices working with questions and answers mechanically operated G09B3/00; computing arrangements G06F

Abstract

A leakage preventing system of confidential information, for example, for CBT (Computer Based Training), prevents leakage of highly confidential education and training information. The system includes a manager terminal unit having an authentication server, an educator/trainer terminal unit for holding confidential information for CBT in the encrypted form and operated by a specific user, and a communication network for exchanging from time to time data between these terminal units. Authentication is given to the educator/trainer terminal unit only when an authentication request from the educator/trainer terminal unit satisfies predetermined authentication granting requirements, and a prescribed limited using time is set so as to make it possible to peruse the confidential information decoded in the educator/trainer terminal unit, only within the limited time.

Claims

1. A leakage preventing system for preventing leakage, to outside, of computer based confidential information for education and training, comprising:

a manager terminal unit having an authentication server under control of a manager;

an educator/trainer terminal unit, having an encrypted data file which stores computer based confidential information for education and training encrypted by encrypting means, operated by a specific user registered in said manager terminal unit; and

a communication network mutually connecting said individual terminal units from time to time for transmission and receiving data;

wherein

said manager terminal unit gives authentication to said educator/trainer terminal unit and sets a limited perusal time for limiting the perusal time by said user;

said educator/trainer terminal unit on condition of authentication by said manager terminal unit, decodes said confidential information in said encrypted data file and makes it possible to peruse said confidential data by a prescribed browser only within said limited perusal time; and

said limited perusal time set by said manager terminal unit in said educator/trainer terminal unit is at least one of lapse of prescribed time relative to date and time of startup of said browser and lapse of non-operating time set beforehand after the startup of said browser.

2. A leakage preventing system according to claim 1, wherein said limited perusal time is said lapse of non-operating time by the user.

3. A method for preventing leakage, to outside, of computer based confidential information encrypted by encrypting means, comprising:

a step of installing said confidential information in an encrypted data file of an educator/trainer terminal unit used by a specific user;

a step of sending an authentication request from said educator/trainer terminal unit via a prescribed communication network to a manager terminal unit managed by a manager;

a step of granting authentication to said educator/trainer terminal unit, and setting a limited perusal time for limiting the perusal time of said user; and

a step of making it possible to peruse said information by a prescribed browser only within said limited perusal time by decoding said confidential information in said encrypted data file on said educator/trainer terminal unit, wherein

said limited perusal time set by said manager terminal unit in said educator/trainer terminal unit is at least one of lapse of prescribed time relative to date and time of startup of said browser and lapse of non-operating time set beforehand after the startup of said browser.

4. A method for preventing leakage according to claim 3, wherein said limited perusal time is said lapse of non-operating time by the user.