The invention discloses a device for defending invasive
attack. The device comprises one or more sensors, one or more
metal wires, a
comparator and a controller, wherein the
signal transmitting end of each sensor is used for transmitting a
signal, and the
signal receiving end of each sensor is used for detecting the integrity of the signal; the
metal wires are covered above a protected circuit and used for connecting the signal transmitting ends and the signal receiving ends of the sensors together; the input end of the
comparator is respectively connected with the signal transmitting ends and the signal receiving ends of the sensors and used for comparing the signals of the signal transmitting ends and the signal receiving ends, and the output end of the
comparator is connected with the
data input end of an alarm mark; and the controller is used for controlling the signal update of the signal transmitting ends of the sensors, controlling the comparator to periodically detect the
connectivity of the
metal wires and enabling the alarm mark to be valid when the
connectivity of the metal wires is abnormal. Through the device, the internal signals of an
integrated circuit (IC)
chip can be effectively prevented from being detected by the invasive
attack, the security of user data is protected, and the security strength of the IC
chip is improved.