CA, the full name of Certificate Authority, is the authority of digital certificates, and its role is to verify and issue digital certificates to ensure the security and credibility of communication. Through the digital certificate issued by CA, the identity and communication security of the website server can be guaranteed, and security problems such as hacker attacks and information leakage can be prevented.

There are four steps in the process of issuing digital certificates: verification, authentication, issuance and maintenance. First, the client submits a certificate application, and CA verifies and audits the applicant and his background information to ensure authenticity and legality. If the applicant is verified, CA will begin to authenticate and evaluate the scope of its certificate. Once the validity and accuracy of the certificate are confirmed, CA will issue a digital certificate and store it in the public database. Finally, CA institutions need to maintain information such as the validity period and renewal of certificates to ensure the continuous security and reliability of digital certificates.

The application scenarios of digital certificates are very extensive, including online banking, e-commerce, education and learning, medical and health care, government administration and other fields. Through digital certificates, the security and credibility of online transactions can be guaranteed, and the identity identification and information protection of users and websites can be ensured. At the same time, digital certificates are gradually applied to more fields, such as electronic bill management, robot interaction, financial market and so on, which provides important support and guarantee for the development of the information age.