Definition：

　　A hardware device with a USB interface, embedded with a smart card chip, and equipped with a certain amount of storage space. It is mainly used as a secure carrier for digital certificates and private keys in a Public Key Infrastructure (PKI) system and serves as a security shield for identity authentication in online banking.

　　Security:

　　It adopts the PKI public key system. The RSA key pair is generated inside the USB Key, and the private key can never be exported, ensuring the certificate holder's information security. It also uses a two-factor authentication system ("Key + PIN code") to ensure the legitimate use of digital certificates and private keys.