Want it. The reason for applying for CA certificate in bidding is that 1 digital certificate is the most mature and widely used information security technology in the world. Generally speaking, a digital certificate is an identity card of an individual or unit on the network. Digital certificate is based on cryptography, using digital signature, digital envelope, time stamp service and other technologies to establish an effective trust mechanism on the Internet. It mainly includes the information of the certificate owner, the public key of the certificate owner and the signature of the certificate issuing authority. CA(Certificate Authority) is an authoritative and impartial third-party trust institution that provides network authentication services using public key infrastructure technology, and is responsible for issuing and managing digital certificates. Its role is similar to that of issuing certificates in our real life, such as ID card handling institutions.