Generally speaking, users need to bring relevant certificates to the certificate acceptance points in various places, or directly go to the certificate issuing agency, namely CA Center, to fill in the application form for identity verification. After verification, they can get the relevant media (disk or key) with certificate and a password envelope with password.

Digital certificate is an authoritative electronic document, which provides a way to verify identity on the Internet. Its function is similar to the driver's driving license or ID card in daily life. It is issued by the authoritative organization-CA Certificate Authority Center, and people can use it to identify each other in Internet communication. That is, the encryption technology based on digital certificate can encrypt and decrypt the information transmitted on the network, and digitally sign and verify the signature, thus ensuring the confidentiality and integrity of the information transmitted on the network, the authenticity of the identity of the transaction subject and the undeniable signature information. Of course, in the process of digital certificate authentication, Digital Certificate Certification Center (CA) plays an important role as an authoritative, fair and reliable third party. Digital certificates must also be unique and reliable.

When applying for a domain name certificate, you don't need to submit written examination materials, just verify the validity of the domain name and apply online. However, the enterprise certificate needs to verify the ownership of the website strictly, and the certificate marks the details of the enterprise organization to strengthen trust. The enhanced certificate not only strictly verifies the true identity of the website owner, but also adds third-party verification. The certificate label enhances the details of the organization and strengthens trust.

The format of digital certificate generally adopts the international standard X.509V3, and the standard X.509 digital certificate includes the following contents:

Version information of the certificate;

Serial number of certificates, each certificate has a unique serial number;

The signature algorithm used by the certificate;

The name of the certificate issuer, and the naming rules generally adopt X.500 format;

The validity period of the certificate, the universal certificate generally adopts UTC time format, and its timing range is1950-2049;

The name of the certificate owner, and the naming rules generally adopt X.500 format;

The public key of the certificate owner;

Signature of the certificate issuer on the certificate.