Performance Evaluation for PUF-based Authentication Systems with Shift Post-processing

摘要

PUF（Physical Unclonable Fhnction）は，デバイスの物理的な特徴を抽出しデバイス固有の値を出力する関数で，ICカード認証等への応用が期待されている.しかし，PUFは認証精度に重要なランダム性が足りないという問題があり，PUFの出力結果はそのまま鍵として使用することが困難である.本論文では，PUFの出力データに簡単なシフト処理を行うことで，よりランダム性が高く，なおかつデバイスの信頼度を保ったまま認証精度を向上させる手法について検討する.%A physical unclonable function (PUF) is a physical system with a device manufacturing variations and could be useful for authentication of integrated circuits. However, it is claimed that the amount of randomness in the PUF output is limited. Therefore, the response of the PUF cannot be used directly as a key. In this paper we discuss a making method of the PUF output with much more randomness while maintaining the reliability. In order to do this, a simple shift post-processing will apply to the PUF output. The experimental results show that the authentication system using shifted response data have improved performance compared to non-shifted data.