Verification needs to include the following contents: certificate integrity verification, that is, to confirm that this certificate has not been tampered with by others. This verification can be done by verifying the digital signature of the CA in the certificate. Certificate credibility verification is to confirm that the certificate is issued by a trusted CA.
A digital certificate is a series of numbers that represent the identity information of all communication parties in Internet communication. It provides a method to verify the identity of communication entities on the Internet. A digital certificate is not a digital ID card, but a seal or seal stamped by an identity authentication institution or a signature added to a digital ID card. It is issued by CA, also known as Certificate Authority Center. People can identify each other with digital certificates online.