Wildcard SSL Certificates: The Ultimate Guide to Securing Your Website and Subdomains

If you own a website in 2024, SSL is no longer optional—it‘s a must. With cyber threats constantly evolving and privacy concerns at an all-time high, visitors expect the websites they interact with to be secure. In fact, research shows that 84% of users would abandon a purchase if data was sent over an insecure connection.

As an online business owner, it‘s crucial to encrypt every aspect of your site, from your main domain to each and every subdomain. But purchasing, installing, and managing individual SSL certificates for each domain and subdomain can be a huge hassle. That‘s where wildcard SSL certificates come in.

In this ultimate guide, we‘ll dive into exactly what wildcard SSL certificates are, how they work, and how they can simplify SSL management for your website. Plus, we‘ll provide expert tips on choosing and installing the right wildcard certificate for your needs. Let‘s get started!

What is a Wildcard SSL Certificate?

A wildcard SSL certificate is a special type of SSL certificate that allows you to secure your main domain and an unlimited number of its subdomains with a single certificate. It‘s called a "wildcard" certificate because it uses the wildcard symbol (*) to represent all possible subdomains.

For example, let‘s say your main domain is example.com. You also have a blog at blog.example.com, an online store at shop.example.com, and a client portal at portal.example.com. With a wildcard certificate for *.example.com, you can secure all of those subdomains and your main domain with a single certificate.

Wildcard SSL certificates provide the same level of encryption and authentication as a standard single-domain SSL certificate. The main difference is the ability to cover subdomains at scale.

How Common are Wildcard SSL Certificates?

While exact statistics on wildcard SSL adoption are hard to come by, we can look at SSL adoption as a whole. As of 2024:

• Over 90% of websites use SSL/HTTPS
• 80% of web pages loaded by Google Chrome are loaded over HTTPS
• Less than 2% of websites have no SSL at all

As HTTPS has become the norm, wildcard SSL certificates have grown in popularity among website owners with multiple subdomains. They offer a cost-effective and manageable way to implement SSL across a complex website.

How Do Wildcard SSL Certificates Work?

To understand how wildcard SSL works, let‘s first look at how SSL/TLS works in general. SSL (Secure Sockets Layer) and its successor TLS (Transport Layer Security) are cryptographic protocols that provide secure communication over a network.

When a user connects to an HTTPS-secured website, their browser and the web server perform an "SSL/TLS handshake" to verify identities and establish an encrypted connection. This process involves several steps:

1. The client sends a "hello" message to the server with its TLS version and cipher suite.
2. The server sends back its SSL certificate, which contains its public key, for the client to verify.
3. The client verifies that the SSL certificate is valid and trusted.
4. The client generates a session key and encrypts it with the server‘s public key, then sends it to the server.
5. The server decrypts the session key with its private key.
6. The client and server use the session key to encrypt and decrypt data for the rest of the session.

In the case of a wildcard SSL certificate, the certificate presented by the server in step 2 is valid for the main domain and any subdomains. The wildcard symbol in the certificate‘s subject name field allows it to cover all possible subdomains.

For example, a wildcard certificate for *.example.com would have a subject name like:

CN = *.example.com
O = Example Inc
L = Townsville 
S = State
C = US

This certificate could be used to secure example.com, blog.example.com, shop.example.com, or any other subdomain of example.com. The SSL/TLS handshake process is the same as for a single-domain certificate, but the certificate is more widely applicable.

It‘s important to note that wildcard SSL certificates still require a dedicated IP address, just like other types of SSL certificates. Each subdomain can use the same certificate, but it needs to have its own IP address.

Benefits of Using a Wildcard SSL Certificate

There are several key benefits to using a wildcard SSL certificate over individual single-domain certificates:

1. Cost Savings: Purchasing a single wildcard certificate is almost always cheaper than buying many individual single-domain certificates, especially if you have many subdomains.

2. Simplified Certificate Management: Managing many individual SSL certificates can be complex and time-consuming. With a wildcard certificate, there‘s only one certificate to keep track of and renew. This reduces the risk of accidentally letting a certificate expire.

3. Flexibility for the Future: If you think you might add more subdomains in the future, a wildcard certificate lets you secure them without additional cost or effort. You can launch new subdomains with HTTPS from day one.

4. Boost SEO and User Trust: HTTPS is a confirmed Google ranking signal. Securing your entire domain, including subdomains, with an SSL certificate can give your SEO a slight boost. More importantly, it builds trust and confidence among your website visitors.

Here‘s a closer look at how a wildcard SSL certificate could save you money compared to single-domain certificates:

Number of Subdomains	Single-Domain SSL Cost (per year)	Wildcard SSL Cost (per year)
1	$50	$150
5	$250	$150
10	$500	$150
20	$1000	$150

*Prices are estimates based on common certificate authority pricing as of 2024. Actual prices may vary.

As you can see, the cost savings of a wildcard SSL certificate scales with the number of subdomains you need to secure. For just a few subdomains, a wildcard certificate may be slightly more expensive. But for a large and growing website, a wildcard certificate is by far the most economical option.

Potential Drawbacks of Wildcard SSL Certificates

While wildcard SSL certificates offer many benefits, there are a few potential drawbacks and risks to be aware of:

1. Higher Stakes for Key Compromise: With a wildcard certificate, the same private key is used on all subdomains‘ servers. If an attacker manages to compromise the private key on one subdomain, they could potentially impersonate any of your subdomains. Careful private key management is essential.

2. No Extended Validation (EV): Wildcard certificates are only available with domain validation (DV) or organization validation (OV), not extended validation (EV). If you need the extra visual trust signals of an EV certificate, you‘ll need to purchase individual EV certificates for each domain.

3. Incompatible with Some Hosting Setups: Some hosting providers and CDN services don‘t support wildcard SSL certificates. Be sure to check with your hosting provider before purchasing a wildcard certificate.

Despite these potential drawbacks, wildcard SSL certificates are a smart choice for most websites with multiple subdomains. The benefits of simplified management and cost savings usually outweigh the risks. Plus, most of the risks can be mitigated with proper certificate management practices.

Choosing the Right Wildcard SSL Certificate

If you‘ve decided a wildcard SSL certificate is right for your website, the next step is selecting the right certificate and certificate authority (CA). Here are some key factors to consider:

• Validation Level: Wildcard certificates come in two validation levels: domain validation (DV) and organization validation (OV). DV only verifies you control the domain, while OV also verifies basic information about your organization. Choose OV if you want more visual trust indicators for your visitors.

• Certificate Authority Reputation: Choose a reputable, widely-trusted CA to ensure your certificate will be accepted by all major browsers without warnings. Well-known CAs include Sectigo, DigiCert, Entrust, and GlobalSign.

• Warranty: Look for a CA that offers a warranty to protect you in case of certificate mis-issuance or other errors. The higher the warranty, the better.

• Pricing and Validity Period: Wildcard SSL certificate costs vary based on the CA, validation level, warranty, and features. Look for a certificate that offers the best value for the features you need. Also, consider how many years of validity are included—the industry maximum is 2 years as of 2024.

• Management Tools: Check if the CA provides easy-to-use tools for certificate management, like a web-based console. Some CAs also offer APIs for automating certificate management.

• Customer Support: SSL setup can be tricky, so choose a CA with a reputation for prompt and helpful customer support.

For example, here‘s a comparison of wildcard SSL options from three popular CAs:

CA	Product	Validation	Warranty	Price (1 year)
Sectigo	Sectigo Wildcard	DV	$1,750,000	$249
DigiCert	DigiCert Secure Site Wildcard	DV	$1,000,000	$639
Entrust	Entrust Wildcard SSL	DV	$1,250,000	$699

*Prices and features are as of 2024 and subject to change.

How to Install a Wildcard SSL Certificate

Once you‘ve purchased your wildcard SSL certificate, you‘ll need to install it on each server that hosts a subdomain you want to secure. The exact steps depend on your server setup, but here‘s a general overview:

1. Generate a Certificate Signing Request (CSR): A CSR is a block of encoded text that you submit to the CA to request your certificate. It usually includes information like your domain name, organization, and public key. You can generate a CSR using tools like OpenSSL.

2. Submit the CSR to Your CA: Log into your CA account and follow their process for submitting your CSR. You may need to provide additional validation information.

3. Download Your Certificate: Once the CA has validated your domain and issued your certificate, download it from your account dashboard. You should receive several files, including your certificate, the CA‘s intermediate certificates, and possibly a root certificate.

4. Install the Certificate on Your Server: How you install the certificate depends on your web server. For example, on Apache you would place the certificate files in a specific directory and update your Apache configuration file with the certificate locations. For Nginx, you would update your Nginx configuration file with the certificate details.

5. Configure HTTP to HTTPS Redirects: To ensure all traffic to your domain uses HTTPS, set up 301 redirects from HTTP to HTTPS. You can do this in your server configuration file, via a .htaccess file, or using a WordPress plugin like Really Simple SSL.

6. Test Your SSL Installation: Use an SSL checker tool like SSL Labs to verify your certificate is installed correctly and provides strong security.

If you‘re not comfortable with the technical aspects of SSL installation, consider working with a web developer or your hosting provider‘s support team. Many hosting services also offer SSL certificates with automatic installation and renewal.

The Future of SSL & HTTPS

As we continue into 2024 and beyond, the importance of securing the entire web with HTTPS will only increase. Here are a few key trends that highlight the necessity of SSL going forward:

• HTTP Deprecation: Browser makers like Google and Mozilla have started slowly phasing out HTTP support. In the coming years, accessing any site over HTTP will show a full-page warning. HTTPS will be mandatory.

• Privacy Regulations: Laws like GDPR and CCPA are cracking down on online privacy and data protection. HTTPS encryption is a key aspect of compliance.

• Emerging Web Technologies: New protocols like HTTP/3 and QUIC that improve website performance only work over HTTPS. Adopting these cutting-edge technologies requires an SSL certificate.

By securing your main domain and all subdomains with a wildcard SSL certificate now, you‘re setting your site up for success in the HTTPS-only future.

Frequently Asked Questions

Q: Can I use a wildcard SSL certificate for multiple primary domains?
A: No, a wildcard SSL certificate only covers one primary domain and its subdomains. For multiple primary domains, you‘ll need a multi-domain SSL certificate.

Q: Do I need a dedicated IP address for each subdomain on a wildcard SSL certificate?
A: Yes, each subdomain still needs its own dedicated IP address. The wildcard SSL certificate can be used across all the subdomains, but each one needs to be hosted on a separate IP address.

Q: How long does it take to get a wildcard SSL certificate?
A: It depends on the CA and validation level you choose. Domain validation can be nearly instant, while organization validation can take a few days to a week.

Q: What happens if I don‘t renew my wildcard SSL certificate?
A: If your wildcard SSL certificate expires, users will see a browser warning when trying to access any of your secured domains. It‘s crucial to renew your certificate before it expires to avoid disruption.

Q: Can I change the subdomains covered by a wildcard SSL certificate?
A: Yes, you can add, remove, or change subdomains as needed without modifying your wildcard SSL certificate. As long as the subdomain is a direct child of your main domain, it will be automatically covered.

Wrapping Up

Wildcard SSL certificates are a smart solution for securing your website and all its subdomains with minimal hassle and cost. By understanding how wildcard SSL works and following best practices for certificate management, you can provide a secure and trustworthy online experience for your visitors.

Remember, in today‘s threat landscape, SSL is non-negotiable. Don‘t let a lack of HTTPS drive visitors and customers away. Invest in a wildcard SSL certificate to secure your site from all angles.

Sources

• SSL Shopper, The Importance of SSL Certificates for Websites in 2024
• DigiCert, What Is a Wildcard Certificate?
• Entrust, The Beginner‘s Guide to Wildcard SSL Certificates
• Sectigo, Wildcard vs SAN SSL Certificates: What‘s the Difference?
• HashedOut, TLS Handshake: How Does SSL Work?