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Technical Vocabularyabbreviation · /ˌtiːɛlˈɛs/

TLS

In simple English

TLS is a fundamental security protocol in modern web infrastructure. When you visit a website with HTTPS (which uses TLS), your browser and the server establish an encrypted connection, meaning all data exchanged is protected from eavesdropping. TLS operates at the transport layer of the internet, sitting between the application layer and the underlying network communication. In tech companies, engineers discuss TLS configurations, certificate management, handshakes, cipher suites, and version support (TLS 1.2, TLS 1.3 are current standards). Security teams ensure TLS is properly implemented across all production systems. The protocol has evolved over time, with older versions (SSL, TLS 1.0, TLS 1.1) now considered insecure and deprecated in favor of TLS 1.2 and TLS 1.3.

Understanding TLS: the security protocol that encrypts internet communications

At a glanceCEFR C1
Commonness5/5
Versatility4/5
FormalityCasualFormalFormal
Spoken ↔ WrittenSpokenWrittenBoth
Directness ↔ DiplomaticDirectDiplomaticDirect
RegionUS and UK
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Say it like this

✓We are migrating to TLS 1.3
✓The TLS handshake failed
✓Enable TLS encryption on the connection

Real examples

in a security standup

"We identified that three services are still using TLS 1.1, which is no longer secure."

in a code review

"Make sure the API client validates the TLS certificate before sending credentials."

in a team meeting

"Our compliance audit requires that all external connections use TLS with strong cipher suites."

Don't say this

Handle with care. TLS is a protocol, not a verb—do not use it as 'to TLS something'. Do not confuse TLS with SSL, though SSL is its predecessor.

✕We need to TLS the connection.
✓We need to enable TLS on the connection.— TLS is a protocol, not a verb. Use phrases like enable, implement, or configure instead.
✕The website uses SSL so it is secure.
✓The website uses TLS (the successor to SSL) so it is secure.— While SSL and TLS are related, TLS is the current standard. SSL is deprecated and should not be used.
✕TLS protects the application layer.
✓TLS protects the transport layer.— TLS operates at the transport layer of the OSI model, not the application layer.

Other forms

noun

TLS

"TLS is required for all customer-facing APIs."

noun

TLS certificate

"The TLS certificate expired, causing the service to become inaccessible."

noun

TLS version

"We recommend using TLS version 1.3 or higher."

Often used with

TLS certificateRefers to the digital credential used in TLS handshakes
TLS handshakeThe initial negotiation process between client and server to establish a secure connection
TLS versionRefers to specific releases like TLS 1.2 or TLS 1.3
enable TLSCommon phrase meaning to activate TLS on a service or connection
TLS encryptionThe cryptographic protection provided by TLS protocol

Similar words

HTTPSHTTP with TLS—refers to the application of TLS to web traffic, but is not interchangeable with TLS itself
SSLThe deprecated predecessor to TLS, no longer recommended for use

Opposites

unencrypted connectionplaintext transmission

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Practice

Try it

4 quick exercises

Complete the sentence

1. All production APIs must use _______ 1.2 or higher to ensure secure communication.

Spot the mistake

2. Which sentence uses TLS incorrectly?

Pick the most natural phrasing

3. Your team discovered a service using an old SSL version. What do you say in a meeting?

Rewrite naturally

4. Rewrite in tech English: 'We need to make sure the connection between the client and server is protected with the new security protocol.'

Questions

Quick poll

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