Modified 2 August 2026

AI glossary

TLS

Transport Layer Security — the encryption protocol that secures almost all internet traffic today. It is what the "S" in HTTPS stands for. When you send an API key to OpenAI, TLS protects it from being read by others on the way. The modern standard is TLS 1.3. Without TLS, everything is sent in plain text.

Related terms

• Security
• API key

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