Abstract: This paper proposes a lightweight RFID ownership transfer protocol based on chaos encryption（CELOTP） for some security problems caused by the change of the ownership of the RFID system in its life cycle. The Arnold cat chaotic map, with lowly implementation costs and randomness, is used to generate the key sequences to improve the security of encryption. A dynamic refresh random function is used to reduce the cost of tags and maintain the freshness of the communication process. Using the challenge response mechanism, the Flag is used to indicate the ownership, which improves the security of the protocol communication. The security of this protocol is proved by BAN-logic. Security analysis and performance analysis of the protocol show that the protocol not only satisfies the security requirement of tag transfer, but also has low cost and is suitable for low cost RFID system.

Key words: Radio Frequency Identification（RFID）, chaos encryption, ownership transfer, Arnold cat, BAN logic

摘要： 针对RFID系统在其生命周期内所有权转移的安全问题，提出一种基于混沌加密的轻量级RFID所有权转移协议（CELOTP）。采用实现代价低和随机性强的Arnold cat混沌映射产生密钥序列，提高加密的安全性。采用动态刷新随机函数来降低标签成本和保持通信过程的新鲜性。采用挑战响应机制，利用Flag标志位来表示所有权的归属，提高了协议通信的安全性。通过BAN逻辑形式化证明了协议的安全性。安全性分析和性能分析表明该协议不仅满足标签所有权转移的安全需要，而且成本较低，适用于低成本的RFID系统。

关键词: 射频识别, 混沌加密, 所有权转移, Arnold cat, BAN逻辑