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SSL vs TLS | What's the Difference Between SSL and TLS?
Learn the difference between SSL and TLS, why TLS replaced SSL, and why modern websites still refer to SSL certificates even though they use TLS encryption.
The terms SSL and TLS are often used interchangeably, but they are not the same technology.
Secure Sockets Layer (SSL) was the original protocol developed to encrypt internet communications. Over time, security researchers discovered vulnerabilities in SSL, leading to the development of a more secure successor known as Transport Layer Security (TLS).
Today, nearly every secure website uses TLS, even though the industry still commonly refers to digital certificates as "SSL certificates."
Secure Sockets Layer (SSL) was introduced in the 1990s to provide encrypted communication between web browsers and servers.
SSL helped establish trust by encrypting sensitive information such as:
Login credentials
Credit card details
Personal information
Business data
However, SSL 2.0 and SSL 3.0 are now considered obsolete because they contain known security vulnerabilities.
Transport Layer Security (TLS) is the modern replacement for SSL.
TLS provides stronger encryption, improved authentication, better performance, and enhanced protection against modern cyber threats.
Current secure websites typically support:
TLS 1.2
TLS 1.3
Older versions such as TLS 1.0 and TLS 1.1 have also been deprecated.
The term "SSL certificate" has remained popular because it became widely recognised before TLS replaced SSL.
Most Certificate Authorities, hosting providers, and web professionals continue using the familiar term even though the underlying technology relies on TLS.
In practice:
SSL Certificate = TLS Certificate
SSL Encryption = TLS Encryption
SSL Connection = TLS Connection
The terminology remains for simplicity and industry recognition.
TLS was introduced to address weaknesses found in SSL.
Key improvements include:
Stronger encryption algorithms
Better authentication mechanisms
Improved key exchange
Enhanced protection against known attacks
Better overall performance
Support for modern cybersecurity standards
These improvements make TLS significantly more secure than legacy SSL protocols.
Modern websites should support:
TLS 1.2
TLS 1.3
Website owners should disable:
SSL 2.0
SSL 3.0
TLS 1.0
TLS 1.1
Keeping only modern TLS versions enabled helps improve website security and compatibility with modern browsers.
Several tools can verify which protocols your website supports.
Useful tools include:
TLS Checker
SSL Checker
Website Security Scanner
Qualys SSL Labs
HostedScan Website Security Scanner
Regular testing helps identify outdated protocol configurations.
No. SSL has been deprecated. Modern secure websites use TLS.
The name remains widely recognised within the industry, even though the technology behind today's certificates uses TLS.
Yes. TLS provides stronger encryption, improved authentication, and significantly better protection against modern cyber threats.
HTTPS relies on TLS to establish secure encrypted communications between browsers and web servers.
Yes. SSL protocols should be disabled in favour of TLS 1.2 and TLS 1.3 whenever possible.
While the terms SSL and TLS are often used interchangeably, modern internet security relies entirely on TLS.
Understanding the difference helps website owners make informed security decisions and ensure their servers support current encryption standards.
Whether you purchase an "SSL certificate" or a "TLS certificate," you are using modern TLS technology to secure your website and protect visitor data.
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