Leveraging Multi-Domain SSL Certificates: Is It Possible to Secure Multiple Domains?

Securing multiple domains can be a challenging task, especially when each one needs a separate SSL/TLS certificate. Fortunately, a solution exists in the form of “Subject Alternative Names” (SANs) or “Unified Communications Certificates” (UCCs). Known as Multi-Domain SSL Certificates, these certificates simplify domain security. In this article, we delve into the details of SSL certificates and their application for multiple domains, starting with the basics.

What are SSL Certificates?

An SSL (Secure Socket Layer) certificate is a digital certificate that is used to secure communication between a website and its visitors. When a website has an SSL certificate installed, it allows for a secure and encrypted connection between the website’s server and the visitor’s web browser. Therefore, no eavesdroppers can access or steal data being transmitted. So with the increasing rate of data breaches and security attacks, the SSL certificate can be an excellent measure to mitigate this menace.

It’s worth noting that SSL certificates are now deprecated and have been replaced by TLS (Transport Layer Security) certificates, which perform the same function, but with a more secure protocol. However, the term “SSL certificate” is still commonly used to refer to TLS certificates.

Can I Use One Certificate For Multiple Domains?

In general, SSL/TLS certificates are issued for a specific domain or subdomain. However, some SSL/TLS certificate authorities offer Multi-Domain (SAN) or Wildcard certificates that allow you to secure multiple domains or subdomains with a single certificate.

A Multi-Domain (SAN) certificate allows you to secure up to several hundred domain names (depending on the certificate authority) with a single certificate. You can add or remove domain names as needed during the validity period of the certificate.

A Wildcard certificate can be used to secure any number of subdomains for a single domain. For example, a Wildcard certificate for *.example.com can be used to secure mail.example.com, login.example.com, and shop.example.com.

Keep in mind that using a single certificate for multiple domains can have some drawbacks. For example, if one of the domains on the certificate is compromised or has an SSL/TLS vulnerability, all of the other domains on the certificate may also be affected. Additionally, if you need to revoke the certificate for one domain, all of the other domains on the certificate will also be affected.

It’s important to carefully consider your needs and the security implications before using a single certificate for multiple domains.

How Do Multi-Domain SSL Certificates Work?

Keep in mind that multi-domain SSL certificates can also be referred to as Subject Alternative Name (SAN) certificates or Unified Communications Certificates (UCC) certificates. So do not get confused in case you meet any of these terms.

A SAN SSL certificate is essentially a single SSL certificate that can be used to secure multiple domain names or subdomains. This is useful for websites that have multiple subdomains or domain names, as it saves time and money on purchasing individual SSL certificates for each one.

When a SAN SSL certificate is issued, the certificate authority includes all the domain names or subdomains that are listed in the certificate as Subject Alternative Names. When a user visits a website that is secured by a SAN SSL certificate, the certificate is presented to the user’s web browser. The web browser checks the certificate to ensure that it is valid and issued by a trusted certificate authority. If the certificate is valid, the browser establishes a secure connection with the web server using the encryption keys included in the certificate.

In summary, SAN SSL certificates work by allowing multiple domain names or subdomains to be secured with a single SSL certificate, which saves time and money for website owners. When a user visits a website secured by a SAN SSL certificate, their web browser checks the certificate to ensure that it is valid and establishes a secure and encrypted connection with the web server using the encryption keys included in the certificate.

Reasons To Buy Multi-Domain SSL Certificates for Your Website

So, Why should you should buy multi-domain SSL certificates over other certificates, such as single-domain and wildcard SSL certificates?

Here are some reasons why you might want to consider purchasing a multi-domain SSL certificate for multiple domains:

1. Cost-effectiveness: Instead of buying separate certificates for each domain, one multi-domain SSL certificate can secure numerous domains. This consolidation offers significant savings.
2. Simplified Certificate Management: Managing multiple SSL certificates for each domain can be a tedious task. Opting for a multi-domain solution, you’ll only need to administer a single certificate. This change not only saves time but also reduces complexity in certificate management. To delve deeper into effective certificate management, refer to this SSL Certificate Management Guide.
3. Enhanced Security: SSL certificates provide a secure, encrypted connection between your website and its visitors, safeguarding sensitive data such as login credentials, credit card numbers, and other personal information. To further understand the importance of these security measures, check out these online privacy best practices.
4. Boosts Trust and Credibility: Visitors perceive websites displaying an SSL certificate as more trustworthy and credible. Securing multiple domains with one of these certificates signals to your visitors that you take their security and privacy seriously, helping to build trust and increase conversions.
5. Broad Support: This type of certificate can secure up to 100 different domains and subdomains, making it an excellent choice for websites with multiple subdomains or domains hosted on the same server.
6. Compliance with Standards: Many industry standards and regulations, like PCI-DSS, mandate the use of SSL certificates to protect sensitive data. Utilizing a multi-domain certificate helps ensure your website’s compliance with these standards.

How Much Does A Multi-Domain SSL Certificate Cost?

The cost of an MD SSL Certificate can vary depending on the certificate authority (CA) you choose and the number of domains you want to secure. Generally, the cost of a basic Multi-Domain SSL Certificate with coverage for up to 3 domains can range from $50 to $150 per year. However, if you require coverage for more domains or additional features, such as wildcard subdomains, the cost can increase accordingly.

It’s important to note that the cost of an SSL Certificate is not the only factor to consider when choosing a certificate. You should also consider the level of encryption, the reputation of the CA, and the level of customer support provided by the CA.

Conclusion

A multi-domain SSL certificate makes it possible to secure several domains using only a single SSL certificate. This can provide numerous benefits for your website, including cost savings, simplified management, enhanced security, increased trust and credibility, and compliance with industry standards. This article has explained what a multi-domain is, how it works to secure multiple domains, and the benefits it brings forth to its users.