フレキシブル有機回路のバラつきを利用した新奇IoTセキュリティ

抄録

This study aimed to examine physical unclonable functions (PUFs) utilizing flexible organic circuits for security in the IoT society. PUFs use inherent manufacturing variations in devices for chip authentication. Therefore, unlike conventional memory data-based security, they can protect against replication and counterfeiting. It is essential to maintain the manufacturing variation in PUFs that serves as the core of the security information and reduces the ID generation error rate. To reduce the error rate, it is useful to suppress the element degradation that causes measurement variations and apply appropriate corrections based on the operational model. Certain characteristics, such as the reproducibility (intra-HD) and uniqueness of IDs (inter-HD), significantly affect the error rate authenticity determination; therefore, it is important to properly estimate them. Since PUFs can utilize various types of variations, preparing separate security elements becomes redundant. For example, by acquiring current variations in the TFT array of a flexible display, it is possible to use them as the source of an encryption key through software or hardware calculations. Therefore, the cost of element implementation can be relatively low in devices, such as flexible displays/sensors, that employ several elements. These devices are expected to play a critical role in IoT security in the future.