PROGRAM PROTECTION METHOD, PROGRAM PROTECTION PROGRAM, AND PROGRAM PROTECTION DEVICE

摘要

PROBLEM TO BE SOLVED: To prevent dishonest acts such as analysis, alteration, and impersonation to an executable program developed in a memory.;SOLUTION: A protection device 100 for exclusive use is connected to a general-purpose bus of a PC in a form of a PCI card or the like. The dividing part 301 of the protection device 100 divides the program into blocks of random sizes. The blocks have the order changed, are replaced by functionally equivalent code strings or are multiplexed by using a plurality of blocks by a reconfiguration part 302 and then are subjected to address solution and are loaded to a main memory 102 by a DMA part 303. Thus the protected program has the appearance changed complicatedly each time of execution. A memory image of the program in loading is preserved and is aperiodically collated with a current memory image to check whether the program has been altered.;COPYRIGHT: (C)2005,JPO&NCIPI