| 摘要 |
A semiconductor device for effectively preventing forgery or alteration of IC cards or the like handling important information, comprising electrodes (12, 13), each having an unshaped irregular surface and provided, respectively, on the IC chip side and the substrate side, wherein the electrodes are connected to each other, with the IC chip (11) facing downward and the connection resistance is employed as a key code by subjecting the capacitance between the electrodes to A/D conversion, thus preventing the duplication of IC cards or the like by employing the connection resistance having a random value as the key code of cryptograph. |
