Multi-level Offline Delegation Transfer in Mobile RFID Networks

Mobile Radio Frequency Identification (RFID)is a wireless technology that integrates RFID readers into mobile devices, such as a smart phone or a PDA. Such integration has provided much mobility for RFID and has greatly improved its applications because RFID is no longer confined by readers' locations and mobile readers are able to cover wider area. One of the most important applications in recent mobile RFID research is offline delegation. Assume a tag is embedded to a specific material in a supply chain; a back-end server can delegate the tag's access right to a mobile reader during a transaction. The delegated reader and the tag, therefore, are able to do offline mutual authentication. In 2010 Yang proposed an offline delegation protocol for mobile RFID, but his scheme requires heavy computation loads for tags and readers. And its key updating can even cause asynchrony. This paper analyzes the security issues in Yang's offline delegation protocol and provides a more efficient and secured delegation scheme that demands lower computation loads and resists most current network threats.

關鍵字

mobile RFID ； delegation ； security

並列摘要

行動式無線射頻識別（Mobile RFID）是一種結合了RFID讀取器和行動器材的無線技術。舉凡智慧型手機或PDA皆可應用在該領域。其中一重要之應用即為離線委任授權機制。後端資料庫可以將電子標籤的存取權預先授與行動讀取器，使其可在離線狀態下與電子標籤進行身分確認及授權驗證。楊提出的委任授權協定（2010）會造成讀取器和標籤的大量運算，並產生不同步。本文將對其進行安全性分析並改良其缺失。我們的離線委任授權有較低的計算量，且能預防大部分的網路威脅。

並列關鍵字

Mobile RFID ；委任；安全

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