Sensitive information identification system and sensitive information identification method

The invention relates to the field of information security, in particular to an information identification system and an information identification method. The information identification system comprises transaction platforms, a gateway, a payment platform, a secret key management platform, a first FPE (format preserving encryption) encryptor and a second FPE encryptor, wherein each transaction platform is used for acquiring sensitive information and generating and sending a transaction request, the gateway is connected with the transaction platforms and used for providing an access port for the transaction platforms, the payment platform is connected with the gateway and used for achieving payment for the transaction request, the secret key management platform is connected with the payment platform and used for managing and assigning secret key information of the transaction platforms, the first FPE encryptor is connected with the gateway and used for achieving identification of the sensitive information in the transaction request, and the second FPE encryptor is connected with the secret key management platform and used for decrypting the sensitive information subjected to identification. The information identification system centers on the secret key management platform, secret keys are distributed to each transaction platform, and the sensitive information is encrypted by FPE, so that no change on data length during sensitive information transmission is guaranteed, and security of the sensitive information is ensured.