the USB flash drive issued by the bank is a small gift from the bank? If it is a small gift from the bank, it should be used as an ordinary USB flash drive. If the online banking business of a bank is handled, something similar to a USB flash drive sent by the bank is called U Shield, which is a digital authentication tool for banks on the Internet. It is directly connected to a computer through a USB interface, and has a password verification function, reliable and high-speed small storage device. It is a powerful supplement to the current network security system and a network security product certified by the security evaluation center.