Patent ID: 8769312

Claim:
A tampering monitoring system comprising: a protection control device protecting a computer program; n detection devices monitoring the protection control device, wherein “n” is a positive integer; and a management device, wherein the management device includes: a first generation unit generating d pieces of first distribution data from the computer program, which is authentic, and generating d pieces of verification data from the generated d pieces of first distribution data, wherein “d” is a positive integer smaller than “n”; and a transmission unit transmitting the generated d pieces of verification data, wherein the protection control device includes: a reception unit receiving the d pieces of verification data; a second generation unit generating d pieces of second distribution data from the computer program; a selection unit randomly selecting d detection devices from among the n detection devices; and a distribution unit distributing d data pairs to the randomly-selected d detection devices on a one-to-one basis, each data pair including a different one of the generated d pieces of second distribution data and one of the d pieces of verification data corresponding to the piece of second distribution data, wherein each of the d detection devices judges whether or not the piece of second distribution data in the received data pair is authentic by using the piece of verification data and the piece of second distribution data in the received data pair, judges that the protection control device is not tampered with when judging that the piece of second distribution data is authentic, judges that the protection control device is tampered with when judging that the piece of second distribution data is not authentic, and transmits a judgment result indicating whether or not the protection control device is tampered with, and wherein the management device receives judgment results from the d detection devices and manages the protection control device with regard to tampering by using the received judgment results.