现有的RFID系统中，标签与读写器之间认证用到的共享密钥都是事先设定好，但该做法存在一定的安全缺 陷。为了解决该安全隐患，提出一种基于字合成运算的密钥无线动态生成算法，该算法主要运用在读写器为单个标签生成共 享密钥场景。算法采用标签与读写器各自生成的随机数通过字合成运算加密动态生成共享密钥，确保共享密钥的安全性。通 过安全性分析，可以得知该算法能够有效抵抗假冒攻击及暴力破解攻击等攻击方式。

In the existing RFID system, the shared key which is used in the authentication between tag and reader is set in advance, but there are some security flaws in the system. In order to solve the security problem, this paper proposes a new key wireless dynamic generation algorithm based on Syn. The algorithm uses the random number generated by the tag and the reader to generate the shared key dynamically through the Syn operation to ensure the security of the shared key. Through the security analysis, it can be found that the algorithm can effectively resist the attacks such as impersonation attack and brute force attack