(In public places such as work units and dormitories, you certainly don't like making it easy for others to use your own computer. If only you could add a hardware lock to your computer! If the U disk can be used as a hardware lock for the computer, it is necessary to plug in the U disk when logging in to the system, and use the encrypted information stored in it to authenticate the user, which will undoubtedly further enhance the security of the system. Without the "boot key" of the U disk, no one can enter your computer system. Nowadays, there are many softwares that can use U disk to encrypt the system, but in contrast, the author found one of the most feature-rich software-NaturalLogin.)