Integrated security device and signal processing method used for an integrated security device

An integrated security device, comprising:

• an encryption/decoding processor for executing processing necessary for authentication by using a logic circuit that forms an encryption/decoding function;
• a selector for selecting signals whose number corresponds to a specific number of lines from among signals from a plurality of intermediate nodes of the logic circuit in accordance with a selection signal from outside;
• and
• a signal processor having a function of detecting a glitch caused by the signals corresponding to the specific number of lines selected by the selector, for switch-selecting the signals corresponding to the specific number of lines by supplying the selector with the signal from the outside, to implement both a function of generating a physical random number and a function of generating a device identifier by a physical characteristic based on the glitch detected in accordance with the switch-selected signals corresponding to the specific number of lines.

A signal processing method to be used for an integrated security device, comprising:

• an encryption/decoding processing of executing processing necessary for authentication by using a logic circuit that forms an encryption/decoding function;
• a selecting of selecting signals whose number corresponds to a specific number of lines from among signals from a plurality of intermediate nodes of the logic circuit by switching a selector in accordance with a selection signal from outside;
• and
• a signal processing of executing a function of detecting a glitch caused by the signals corresponding to the specific number of lines selected by the selecting step, and of switch-selecting the signals corresponding to the specific number of lines by supplying the selector with the signal from the outside, to execute both a function of generating a physical random number and a function of generating a device identifier by a physical characteristic based on the glitch detected in accordance with the switch-selected signals corresponding to the specific number of lines.