SELF-REWRITING PROCESSING DEVICE, SELF-REWRITING PROCESSING METHOD, AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To suppress deterioration of performance during execution of a protection object program in a self-rewriting processing device, a self-rewriting method, and program which make analysis and alteration of the protection object program difficult.;SOLUTION: A self-rewriting processing device comprises a CPU and a cache for storing a protection object program. The CPU analyses a control structure of the protection object program (S11), replaces a selected instruction with a dummy instruction (S17) if there is an instruction to be camouflaged with a dummy instruction inside repetitive processing (YES in S13), inserts restoration processing which restores the dummy instruction to the original instruction before the repetitive processing (S18) and inserts camouflage processing which camouflages the original instruction with the dummy instruction again after the repetitive processing (S19).;COPYRIGHT: (C)2013,JPO&INPIT