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AssigneeHitachi, Ltd.
InventorsYuki TANAKA, Kotaro SHIMAMURA, Teruaki SAKATA
Estimating the term…
The present invention aims to provide a control device that reduces load and can provide early detection of program tampering. A main storage unit 102 stores a main application 107 and illegal command information 108. The main application 107 is an extension program in which target commands, which are at least some of the commands included in a prescribed program, have been converted into extension commands. The illegal command information 108 indicates the target commands. A command monitoring unit 104: compares executed commands, which are commands that have been executed by the CPU 103, and target commands, which are indicated in the illegal command information 108; and determines whether or not an executed command is an illegal command, based on the comparison results.
A control device comprising:
An unauthorized command detection method by a control device that includes a processor and a main storage unit that stores an extension program executed by the processor and unauthorized command information indicating a target command that is at least a part of commands included in a predetermined program, the extension program being obtained by converting the target command into an extension command, the method comprising:
A program causing a control device, which includes a processor and a main storage unit that stores an extension program executed by the processor and unauthorized command information indicating a target command that is at least a part of commands included in a predetermined program, the extension program being obtained by converting the target command into an extension command, to execute a procedure of:
Dependencies are inferred from the claim text.