Method for realizing wireless generation of single-label key by using word synthetic operation

In an existing RFID system, shared keys used for bidirectional authentication between a label and a reader-writer are preset, and certain security risks exist in the scheme more or less. In order to solve the above security problems, the invention provides a dynamic key generation algorithm based on a word synthetic operation. The specific scene used by the algorithm is that the reader-writer generates a shared key value for a single label. According to the algorithm, the shared keys are no longer preset, but are generated in a wireless manner before authentication, the shared keys are finally obtained by encrypting random numbers that are separately generated by the reader-writer and the label through the word synthetic operation, and thus the security of the keys can be ensured. 现有的RFID系统中，标签与读写器之间进行双向认证用到的共享密钥都是事先设置好的，该方案或多或少存在定的安全隐患。为了解决上述存在的安全问题，提出种基于字合成运算的动态密钥生成算法，该算法使用的具体场景是读写器为单个标签生成个共享密钥值。该算法中，共享密钥不再是事先设置好，而是在认证之前通过无线方式生成共享密钥，共享密钥最终是由读写器与标签各自生成的随机数通过字合成运算加密得到的，从而确保密钥的安全。