The concept of CA certification
In the real society, the resident identity card used to confirm identity is issued by the public security organ, which is an authoritative institution that everyone can trust. In the network environment, it is also necessary to have an authoritative organization that everyone trusts to issue electronic signature authentication certificates. This authority is the electronic signature authentication service provider mentioned in the electronic signature law, which we call CA(Certificate Authority). CA is an authentication that can check the legality of online identity. In the actual use environment, the carrier of electronic certificate is a special USB flash drive, which is a hardware storage medium with operating function-USB-key.