Wildcard ssl/tls certificate

What is a wildcard SSL/TLS certificate ？

wildcard SSL Certificate is also called pan domain name SSL certificate , It can protect a domain name and all sub domains of the domain name , Do not limit the number of subordinate domain names .

wildcard SSL The reasons why certificates are so popular are as follows 3 Dali by ：

1、 To save time

wildcard SSL Certificate issuance time is fast , Domain name type generally only needs 1-30 Minutes to issue , And you can add subdomains of the same level infinitely , There is no need to review , It can save a lot of time cost .

2、 To save money

Many companies have business needs , There will be many subdomains , If you apply for a certificate for each domain name , It will be very expensive , And apply for a wildcard SSL certificate , The price will be much cheaper , And there is no additional charge when adding a new subdomain of this level .

3、 Save trouble

Wildcard certificates can protect multiple domain names with one certificate , It can bring greater convenience to certificate management , There is no need to worry about the loss caused by the expiration of the certificate , It saves a lot of trouble .

Wildcard certificates do not limit the number of subdomains at the protected level , Usually use “*” Represent wildcard , namely “*” At what level , All domain names at that level can be protected , It can be replaced with any alphanumeric underscore .

Many enterprises often because of business needs , Will open many subdomains for the website , for example baidu.com, Yes zhidao.baidu.com,www.baidu.com,map.baidu.com Much more *.baidu.com, This is the time , Apply for a certificate for each subdomain , Obviously too cumbersome , The cost will also increase a lot , Management is also relatively troublesome . If you use a wildcard certificate , Then one certificate will complete all secondary subdomains .

If you are just a master domain name, there are many 2 Level subdomain name needs https The protection of the , Then a standard wildcard SSL Certificate can be done .

however , If you have many different primary domain names , Take Baidu for example , Baidu has many domain names , Each domain name has many subdomains , Even subdomains of different levels , As mentioned above , A standard wildcard certificate can only have one domain name and all subdomains under this domain name , What about this situation ？ First of all, please look at the certificate of Baidu and ：

1. This certificate of Baidu contains different main domain names , for example baidu.com,hao123.com etc. ;

2. Baidu's certificate contains wildcards that are not in level one, such as level two or level three , for example *.fanyi.baidu.com Namely baidu.com Of 3 General configuration of level-1 domain name ;

3. In fact, Baidu's certificate also contains specific single domain names , Because of the screenshot , Interested friends can directly open Baidu website and click to view ;

This explains ,SSL Certificates can be used for different primary domain names , Different levels of subdomains , Single domain name, etc .

What kind of wildcard SSL Certificates are cheaper ？

wildcard SSL Certificates are divided into domain name verification type （DVSSL） And enterprise proven （OVSSL） Two levels of verification , Wildcards are not enhanced validation .

Among them, domain name verification （DVSSL） You only need to verify that you have administrative rights to the domain name for which you apply for the certificate , There is no need to verify the true identity of the website enterprise , commonly 1-30 Minutes to issue , And the price is more economical .

Domain name wildcard SSL The certificate ensures that the transmission of website information from the user browser to the server is encrypted , Will not be stolen and tampered with .

This wildcard SSL The certificate is suitable for small and medium-sized enterprise websites with many subdomains 、 Personal website application , And compared with a single application SSL Certificates are much cheaper .

stay Domain name wildcard SSL certificate in , The cheap ones belong to Comodo PositiveSSL Wildcard Certificate; The second is Comodo EssentialSSL Wildcard Certificate.