RFID系统一般包括标签、读写器、后端数据库三部分，其中标签与读写器之间通过无线方式通信，存在一定的安全隐患。为确保通信信息的安全性，提出一种适用于标签与读写器之间的双向认证协议，能够解决该安全隐患问题。双向认证协议采用对消息加密后再传输的机制，使得攻击者窃听的信息并非明文，从而保证信息的安全性。

RFID system generally includes three parts: tag, reader and database, where there is the hidden danger between tags and reader through wireless communication. In order to ensure the security of communication information, a bidirectional authentication protocol which is suitable for label and reader is proposed, which can solve the problem of security hidden danger. Bidirectional authentication protocol adopts the mechanism of transmission after message encryption, which makes the attacker eavesdropping information is not clear, thus ensuring the security of information.