JPH02297626A - System for masking contents of program and data - Google Patents

System for masking contents of program and data

Info

Publication number
JPH02297626A
JPH02297626A JP11889889A JP11889889A JPH02297626A JP H02297626 A JPH02297626 A JP H02297626A JP 11889889 A JP11889889 A JP 11889889A JP 11889889 A JP11889889 A JP 11889889A JP H02297626 A JPH02297626 A JP H02297626A
Authority
JP
Grant status
Application
Patent type
Prior art keywords
program
means
enciphering
instruction
decoding
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
JP11889889A
Inventor
Shigeya Matsuo
Original Assignee
Nec Corp
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

Links

Abstract

PURPOSE:To mask the content of a program even when a memory device is referred during the execution of the program by converting the instruction of an enciphering program to a form feasible with a program execution means by an enciphering program decoding means. CONSTITUTION:When a user starts up a program execution start means 4, the program execution start means 4, after setting an enciphering supply program 1 as the enciphering program 6, starts up the program execution means 12. The program execution means 12 takes out the instruction from the enciphering program 6 set on the memory device 5, and after setting it on an instruction decoding buffer 13, starts up the enciphering program decoding means 14. The enciphering program decoding means 14 decodes the instruction set at the instruction decoding buffer 13, and converts it to the form feasible with the program execution means 12, and sets it on the instruction decoding buffer 13. In such a way, it is possible to mask the contents of the program 1 and data 7.
JP11889889A 1989-05-12 1989-05-12 System for masking contents of program and data Pending JPH02297626A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11889889A JPH02297626A (en) 1989-05-12 1989-05-12 System for masking contents of program and data

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11889889A JPH02297626A (en) 1989-05-12 1989-05-12 System for masking contents of program and data

Publications (1)

Publication Number Publication Date
JPH02297626A true true JPH02297626A (en) 1990-12-10

Family

ID=14747898

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11889889A Pending JPH02297626A (en) 1989-05-12 1989-05-12 System for masking contents of program and data

Country Status (1)

Country Link
JP (1) JPH02297626A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5632024A (en) * 1993-06-08 1997-05-20 Hitachi, Ltd. Microcomputer executing compressed program and generating compressed branch addresses
WO2000057290A1 (en) * 1999-03-19 2000-09-28 Hitachi, Ltd. Information processor
US7131133B1 (en) 1996-09-18 2006-10-31 Kabushiki Kaisha Toshiba Access control method and information utilization apparatus
WO2014125639A1 (en) * 2013-02-18 2014-08-21 三菱電機株式会社 Control program management apparatus, controller apparatus, and control system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5632024A (en) * 1993-06-08 1997-05-20 Hitachi, Ltd. Microcomputer executing compressed program and generating compressed branch addresses
US7131133B1 (en) 1996-09-18 2006-10-31 Kabushiki Kaisha Toshiba Access control method and information utilization apparatus
WO2000057290A1 (en) * 1999-03-19 2000-09-28 Hitachi, Ltd. Information processor
WO2000057278A1 (en) * 1999-03-19 2000-09-28 Hitachi, Ltd. Information processing device
US7082539B1 (en) 1999-03-19 2006-07-25 Hitachi, Ltd. Information processing apparatus
WO2014125639A1 (en) * 2013-02-18 2014-08-21 三菱電機株式会社 Control program management apparatus, controller apparatus, and control system

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