SSL vs TLS Certificates – Key Differences Explained

SSL vs TLS Certificates

The terms SSL (Secure Sockets Layer) and TLS (Transport Layer Security) are often used interchangeably, but technically, TLS is the newer and more secure successor to SSL.

Think of it this way:

SSL was the original protocol developed for securing internet connections. Versions 1.0 and 2.0 had security flaws and are no longer in use. Version 3.0 was the last version of SSL.

TLS was designed as an upgrade to SSL to address its vulnerabilities. TLS versions 1.0, 1.1, 1.2, and the latest 1.3 have been released, each improving security and efficiency.

SSL Certificate term is widely used to refer to security certificates

Therefore, the primary difference is their version and security strength:

SSL certificates, in the strictest sense, would refer to certificates that support the outdated SSL protocol. However, in common usage, and within the industry, the term “SSL certificate” is still widely used to refer to digital certificates that secure websites using the TLS protocol.

TLS certificates are the current standard and support the more secure TLS protocol versions.

All valid and secure certificates are technically TLS certificates

Key takeaways:

All currently valid and secure certificates are technically TLS certificates, even if they are still marketed or referred to as “SSL certificates.”
The underlying technology used for secure connections today is almost always TLS.

When you obtain an “SSL certificate” from a reputable Certificate Authority (CA), you are actually getting a certificate that supports TLS and may also support older SSL versions for backward compatibility (though these older versions should be disabled on the server for security reasons).

In practical terms for a website owner or user:

You don’t need to worry about whether you have an “SSL” or “TLS” certificate. What matters is that you have a valid digital certificate installed on the web server, which enables the HTTPS protocol (the secure version of HTTP) and encrypts communication between the website and the user’s browser. This is indicated by the padlock icon in the browser’s address bar.

So, while there’s a historical and technical distinction, in everyday language and for practical purposes, the terms are often used synonymously, with “SSL certificate” being the more familiar term even when referring to certificates that primarily use TLS.