What is Wildcard SSL?
Take Your Security a Step Further: The Secrets of Wildcard SSL
In today's digital world, the security of websites is as important as their content. SSL certificates are indispensable for protecting users' personal information, projecting a trustworthy image, and taking precautions against cyberattacks. In this guide, we will delve into one of the most useful and economical SSL certificate options, What is Wildcard SSL?. You will learn step-by-step what Wildcard SSL is, how it works, who it is ideal for, and the advantages it offers, allowing you to secure multiple subdomains with a single certificate.
What is Wildcard SSL? Basic Definition
A Wildcard SSL certificate is a special type of SSL certificate that encrypts and validates a main domain name and an unlimited number of its subdomains with a single certificate. The word "Wildcard" means "joker card," indicating that this certificate provides flexibility regarding subdomains, much like a joker card.
For example, if your main domain is `example.com`, with a Wildcard SSL certificate, you can secure as many subdomains as you wish, such as `www.example.com`, `blog.example.com`, `shop.example.com`, `mail.example.com`, with a single certificate. This saves you the hassle of purchasing and managing individual SSL certificates for each subdomain.
How Does Wildcard SSL Work?
Wildcard SSL certificates use Domain Validation (DV) or Organization Validation (OV) methods to validate the domain. DV certificates confirm that you control the domain, while OV certificates additionally verify your organization's identity.
The most important feature of the certificate is the wildcard character () used in the common name section. For instance, the common name of a Wildcard SSL certificate looks like this: `.example.com`. This asterisk () represents any valid subdomain. Thus, the certificate becomes valid for all subdomains matching `.example.com`.
Who is Wildcard SSL Ideal For?
Wildcard SSL certificates are ideal for businesses and individuals who have multiple subdomains or plan to create subdomains in the future. Their primary use cases include:
E-commerce Sites: Subdomains are often used for different sections like `www.sitename.com`, `shop.sitename.com`, `blog.sitename.com`, `support.sitename.com`.
Corporate Websites: Subdomains like `hr.sitename.com`, `sales.sitename.com`, `careers.sitename.com` can be created for different departments or services.
SaaS (Software as a Service) Providers: Wildcard SSL provides great convenience for platforms that offer customers their own subdomains (e.g., `customer1.saasplatform.com`).
Agencies and Web Developers: For agencies managing multiple client sites, securing each client's main domain and subdomains with a single certificate is advantageous in terms of cost and management.
Hosting Providers: Companies offering hosting services to their customers can use Wildcard SSL to manage customer domains and subdomains.
Advantages of Wildcard SSL
When examining What is Wildcard SSL?, it's important not to overlook the key advantages this certificate type offers:
- Cost-Effectiveness: One of the most significant advantages is cost savings. Instead of purchasing individual SSL certificates for each subdomain, you can secure all your subdomains with a single Wildcard SSL certificate. This provides significant financial relief, especially for businesses with numerous subdomains.
- Simple Management: Managing multiple certificates can be complex and time-consuming. Processes like certificate renewals, installations, and tracking are simplified with a single certificate. This reduces the burden on your IT team and lowers the likelihood of errors.
- Broad Coverage: The ability to cover one main domain and an unlimited number of subdomains also provides security for your future needs. When you create a new subdomain, you won't need a new certificate; your existing Wildcard SSL certificate will automatically cover it.
- Security and Trust: Wildcard SSL certificates, like standard SSL certificates, encrypt the data flow between your server and visitors' browsers. This prevents sensitive information (credit card numbers, passwords, etc.) from being intercepted by malicious actors. The green padlock icon displayed in browsers increases visitors' trust by showing them that your site is secure and their information is protected.
- SEO Friendly: Google and other search engines tend to prioritize sites using HTTPS in their rankings. Moving all your subdomains to HTTPS using Wildcard SSL positively impacts your site's search engine performance.
How to Choose and Use a Wildcard SSL Certificate?
Choosing and using a Wildcard SSL certificate involves similar steps to other SSL certificates:
- Choose a Reliable Certificate Authority (CA): Opt for a reputable and trusted certificate authority such as Sectigo, DigiCert, or GlobalSign. CAs may differ in certificate prices and additional features they offer.
- Determine Your Needs: Identify how many subdomains you need to cover and what type of validation (DV or OV) is required. Wildcard SSLs are typically offered at DV or OV levels.
- Purchase the Certificate: Buy a Wildcard SSL certificate from your chosen CA or authorized resellers.
- Complete Domain Validation: Perform the domain validation process according to your certificate provider's instructions. This is usually done via email confirmation, adding a DNS record, or uploading a file.
- Install the Certificate on the Server: Upload the certificate files you received (usually with .crt, .key, and .ca-bundle extensions) to your web server. This process may vary depending on the web server software you are using (Apache, Nginx, IIS, etc.).
- Configure Subdomains: Check your server configuration to ensure the certificate is valid for all your subdomains. This is typically achieved by correctly defining the wildcard character.
Points to Consider
While Wildcard SSL certificates are a great solution, they also have some limitations:
Subdomain Level: Wildcard SSL certificates only cover one level of subdomains. For example, a `*.example.com` certificate covers `blog.example.com` but not second-level subdomains like `sub.blog.example.com`. A different solution may be required for such cases.
Subdomain Validation: Wildcard SSL certificates primarily work with Domain Validation (DV). If additional Organization Validation (OV) or Extended Validation (EV) is required for each subdomain, Wildcard SSL may not meet this need. In such situations, purchasing separate OV or EV certificates for each subdomain might be more appropriate.
