DEVICE AND PROGRAM FOR DETECTING CODE MODIFICATION AND EQUIPMENT LOAN SYSTEM USING THEM

摘要

PROBLEM TO BE SOLVED: To provide a means for detecting and reporting modifications of program codes operated by a process computer.

SOLUTION: The basic system including a code modification detection device comprises a code modification detection device 1; a process computer 2; and electric equipment 3. The code modification detection device 1 is connected to the process computer 2 and the process computer 2 to the electric equipment 3, at respective predetermined interfaces. The code modification detection device 1 detects modifications of a control means 22 (program codes) of the process computer 2. The code modification detection device 1 comprises an input/output control means 11; a summary value calculation means 12; a summary value comparison means 13; a calculation range storage means 14; a reference summary value storage means 15; and a reporting means 16. The process computer 2 comprises an input/output control means 21, a control means 22 and control information 23.

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