Title:
METHOD FOR PROTECTING FILE IN COMPUTER HARD DISK
Document Type and Number:
Japanese Patent JP3248165
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To protect data in a portable computer by preventing any one of selected files from being non-ciphered till a secret key is inputted in order to obtain a ciphering key by means of an audinary sentence and, then, used.
SOLUTION: When the file is ciphered and, then, a user restarts the usage of a computer, the user has to correctly input the secret key 9. Unless the user inputs the correct secret key 9, a file protecting agent 12 urges the user to input the secret key 9. This rule continues up to three times, for example, till a limit being the correction impossible parameter of a program. Unless the user inputs the secret key 9 well within the range of the limit, the file protecting key 12 erases an algorithm which is used for scrambling the secret key 9 at the time of scrambling a cipher key 3. The cipher key 3 is not obtained except scrambling by the secret key 9.
Inventors:
Colin George Harrison
Application Number:
JP4087197A
Publication Date:
January 21, 2002
Filing Date:
February 25, 1997
Export Citation:
Assignee:
INTERNATIONAL BUSINESS MASCHINES CORPORATION
International Classes:
G06F12/14; G06F1/00; G06F3/06; G06F12/00; G06F21/60; G06F21/62; G06F21/64; G09C1/00; H04L9/14; (IPC1-7): G06F12/14; G06F3/06; G06F12/00; G09C1/00; H04L9/14
Domestic Patent References:
| JP6261138A | ||||
| JP6265150A | ||||
| JP59123954A | ||||
| JP2110491A |
Attorney, Agent or Firm:
Hiroshi Sakaguchi (1 person outside)