Shulou(Shulou.com)06/01 Report--

One of the SSL certificate types is "SSL wildcard certificate", which can also be called "pan-domain name certificate". You may be relatively unfamiliar with the SSL wildcard certificate, so here's a detailed introduction to what SSL wildcard certificate is.

The first thing to let you understand is the relationship between the SSL certificate and the website domain name, so that you can better explain what the wildcard certificate is.

SSL certificate and website domain name

SSL certificate not only encrypts the data transmitted by the website, but also has another very important function, which is to identify the domain name of the website.

Website hijacking may be known to many people. If the user visits a HTTP site, then when the user enters the www.abc.com URL, he wants to visit site A, but if the client's computer is hijacked, then what the user sees is likely to be the content of the B site, but it is impossible for the user to find it.

But SSL certificates solve this problem. Each SSL certificate corresponds to the domain name of a website. If a user visits a HTTPS website address that does not match the SSL certificate configured by the website, the browser will report an error. Only if the website domain name address matches the SSL certificate will the browser consider the currently visited website to be secure and trusted.

The user still visits the www.abc.com address, assuming that the user's computer is still hijacked, but when the web page returns the content of site B, the browser will report an error. This is because the content of site B does not have a SSL certificate that matches the www.abc.com domain name. Users will soon know that there is a problem with the current site and will not continue to visit the problematic site.

The use of SSL certificates is very necessary for websites, which can prevent many website security problems.

However, it is a bit inconvenient for a domain name to match a SSL certificate, because if a user has 100 websites, he or she will have to apply for 100 SSL certificates. Designers are certainly not so stupid, so wildcard certificates appear.

Wildcard certificates are used to match N secondary domain names under the same primary domain name. It is generally configured in the form of * .domain.com.

In this way, as long as you apply for a wildcard certificate, you can apply to all websites. This is undoubtedly a very good thing for webmasters who have multiple second-level domain name websites.

At the same time, wildcard certificates also have good scalability. For example, although a webmaster currently has only one primary domain name, if he plans to add multiple secondary domain name sites in the future, then he mainly applies for a wildcard certificate. No matter how many secondary domain name sites are added in the future, there is no need to worry about how to apply for the SSL certificate.

The price of the wildcard certificate

SSL wildcard certificate is very convenient to use, but the price is higher than that of single domain name certificate because it can support a large number of domain names. The following is the price comparison between OV single domain name certificate and wildcard certificate.

From the above SSL certificate price list, you can see that the wildcard certificate is indeed more expensive than a single domain name, but from another point of view, if you apply for four domain names, then the wildcard certificate appears to be particularly cheap. Take GlobalSign as an example, if you apply for four domain names, then the total price is 1863 yuan, while the price of a wildcard certificate will remain the same no matter how many second-level domain names you apply for.

The result is very clear. If you have no more than 4 second-level domain names, you do not need to apply for a wildcard certificate at all, because it is cheaper to apply for a single domain name certificate, but if the number of your secondary domain names is more than 4, then the wildcard certificate must be more cost-effective.

SSL certificate securely encrypts the website, which can effectively prevent hijacking, prevent your website from being maliciously implanted with advertisements, prevent tampering and monitoring from leaking users' passwords, and optimize the SEO ranking of search engines with SSL certificates.

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