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Wildcard SSL Certificates are digital certificates applied to a domain and its various domains, usually purchased from a certificate authority that is granted trust. Wildcard SSL is the best combination of flexibility, compatibility, and cost performance, saving money and time by securing your domain and unlimited subdomains on a single certificate. Wildcard SSL Certificates protect these sites just like regular SSL Certificates and handle these requests with the same authentication methods, except that no security errors are received.

Advantages of Wildcard SSL Certificates 

If you have multiple subdomains to protect, purchasing wildcard SSL Certificates is a good option:

1. Protecting unlimited subdomains requires purchasing individual SSL Certificates for each subdomain, which is sufficient to purchase and use one certificate.

2. Cheap and affordable. Although wildcard certificates cost a lot more than ordinary certificates, if they are used in multiple subdomains, they can easily save hundreds or even tens of thousands of yuan.

3. Easier to manage. Even with PKI management interfaces, deploying 30 different individual SSL Certificates is a daunting task and even more cumbersome to update. But wildcard SSL

(2) The disadvantages of wildcard SSL Certificates can solve these troublesome and complicated problems, and the operation is simple and convenient.

1. Security. If a certificate and private key are used on multiple servers, then when one server is attacked, all other servers are also attacked. For example, if the pay.baidu.com subdomain is destroyed, the mail and cloud subdomains will also be destroyed. This means that certificates must be replaced on all servers as soon as possible.

2. Mobile device compatibility. Some popular mobile device operating systems (5) do not recognize wildcards (*), so wildcard certificates cannot be used. If you need to support these devices, you will need to use a single certificate.

SSL Certificates carry out security encryption on websites, which can effectively prevent hijacking, effectively prevent malicious advertisements from being implanted on your websites, prevent tampering and monitoring from leaking user passwords, and SSL Certificates have an optimized effect on SEO rankings of search engines.

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