Patent ID: 8595858
Filing Date: 2013-11-26
Classification: G06F

Abstract:
1. A tamper detection system, comprising a server, and a device connected to the server through a communication network, wherein the device comprises: a tamper detection section to detect changes of predetermined states of a plurality of pre-defined parts of the device in order to detect a tamper action against the device, and to output detection information; a nonvolatile detection information storage section to store the detection information outputted by the tamper detection section; a nonvolatile request information storage section to store request information for requesting the tamper detection section to detect a change of a predetermined state of a specific part of the plurality of parts; a power supply unit including a main power supply section to supply electric power to the device, and a standby power supply section to supply electric power to the tamper detection section, the detection information storage section, and the request information storage section when the main power supply section is in an off-state; a detection information transmission section to transmit the detection information stored in the detection information storage section to the server; a request information receiving section to receive the request information transmitted by the server; a product assurance invalidating processing execution request receiving section to receive a product assurance invalidating processing execution request transmitted by the server; and a control section, and the server comprises: a detection information receiving section to receive the detection information transmitted by the device; a request information transmission section to transmit the request information to the device; and a product assurance invalidating processing execution request transmission section to transmit the product assurance invalidating processing execution request to the device, the control section controls the tamper detection section and the request information storage section to be supplied with the electric power by the standby power supply section when the main power supply section is in an off-state so that the tamper detection section detects the change of the predetermined state of the specific part in accordance with the request information stored in the request information storage section, the control section controls the detection information storage section to be supplied with the electric power by the standby power supply section when the main power supply section is in an off-state so that the detection information storage section stores the detection information outputted by the tamper detection section, the control section controls the detection information transmission section not to transmit the detection information stored in the detection information storage section to the server when the main power supply section is in an off-state, and to transmit the detection information to the server when the main power supply section is turned into an on-state, and the control section invalidates a part of a function of the device in accordance with the product assurance invalidating processing execution request when the product assurance invalidating processing execution request receiving section receives the product assurance invalidating processing execution request transmitted by the server.