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What Is TLS? | Understanding Transport Layer Security
Learn what Transport Layer Security (TLS) is, how it works, why it replaced SSL, and how TLS protects websites, applications, and online communications.
Transport Layer Security (TLS) is the modern security protocol used to encrypt data transmitted between a user's browser and a web server.
TLS ensures that sensitive information such as passwords, credit card details, personal information, and login credentials cannot be intercepted or modified while travelling across the internet.
Although many people still refer to website security as "SSL," nearly all modern secure websites actually use TLS.
Every time you visit a secure HTTPS website, TLS works behind the scenes to establish an encrypted connection.
Without TLS, attackers could potentially:
Intercept sensitive information
Read passwords and login credentials
Modify website content during transmission
Perform man-in-the-middle attacks
Steal confidential customer data
TLS protects both website owners and visitors by ensuring information remains private and authentic.
Before any encrypted communication begins, the browser and web server perform what is known as the TLS Handshake.
During this process:
The browser connects to the server.
The server presents its SSL/TLS certificate.
The browser verifies the certificate.
Encryption keys are securely exchanged.
An encrypted HTTPS connection is established.
Once the handshake is complete, all communication is encrypted.
Implementing modern TLS provides numerous advantages.
Benefits include:
Encrypts sensitive information
Protects customer privacy
Prevents data interception
Verifies website authenticity
Supports HTTPS connections
Improves website trust
Meets modern browser security requirements
Supports compliance with industry security standards
Several tools allow you to verify which TLS versions your website supports.
Useful tools include:
TLS Checker
SSL Checker
Website Security Scanner
Qualys SSL Labs
HostedScan Website Security Scanner
Regular testing helps ensure your website continues using secure encryption standards.
To maintain strong TLS security:
Enable TLS 1.2 and TLS 1.3.
Disable deprecated TLS versions.
Renew SSL/TLS certificates before expiration.
Monitor your website regularly.
Keep web servers updated.
Test your TLS configuration after server changes.
Following these practices helps maintain a secure browsing experience for visitors.
TLS stands for Transport Layer Security, the protocol used to encrypt internet communications.
No. TLS replaced SSL as the modern encryption standard. Although people still say "SSL certificate," today's certificates typically use TLS.
Yes. HTTPS relies on TLS to establish secure encrypted connections between browsers and web servers.
TLS 1.2 and TLS 1.3 are currently recommended. Older versions such as TLS 1.0 and TLS 1.1 should no longer be used.
Yes. Online TLS checkers and website security scanners can identify supported TLS versions and highlight outdated configurations.
Transport Layer Security (TLS) is the foundation of modern internet security.
Every secure HTTPS website depends on TLS to encrypt communications, protect sensitive information, and verify the authenticity of servers.
Although the term "SSL" remains widely used, modern websites rely on TLS to provide secure online experiences. Keeping your TLS configuration up to date helps protect your visitors while maintaining compliance with current security standards.
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