In summary, SSL digital certificates can be divided into the following two categories.

1. Classification according to verification method

(1) DV type certificate: that is, domain name verification type certificate. After the user submits the application, the system will automatically complete the review and it will usually be issued in about 10 minutes. , cheap but low-level, suitable for personal websites and small organization or corporate websites.

(2) OV certificate: that is, enterprise verification certificate. It not only needs to verify the ownership of the domain name, but also needs to verify the identity of the enterprise, such as corporate information and scanned copies of the company's business license. Compared with DV SSL The certificate security level is greatly improved and is suitable for general organizations or small and medium-sized enterprise websites.

(3) EV certificate: the highest security level certificate in the industry. After installing this certificate, the browser will display a green address bar and the https prefix and security lock logo, as well as the company name, realizing trusted identity authentication and secure data transmission of the website. It is suitable for online trading websites, large enterprises or finance, Banks and other organizations.

2. Classification according to the number of supported domain names

(1) Single domain name certificate: an ordinary SSL certificate that only protects one domain name, which can be a top-level domain name or a second-level domain name.

(2) Multi-domain name certificate: It can protect multiple domain names at the same time, whether it is the main domain name or a sub-domain name. It can generally protect 2 to 250 domain names. When there are new domain names that need to be protected, they can be added at any time. .

(3) Wildcard certificate: It can protect a domain name and all second-level domain names of the domain name. There is a limit on the scope, but there is no limit on the quantity. It is suitable for users who have a large number of second-level domain names.