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Mutual TLS (mTLS)

Encryption

TLS (Transport Layer Security) Secure Connection Certificate Authority (CA) Public Key Infrastructure (PKI)

TLS where both sides prove who they are using certificates.

Definition

Mutual TLS is like a two-way ID check: the server proves it’s real, and the client proves it’s allowed.

In plain English TLS where both sides prove who they are using certificates.

Why this matters

Why it matters: It can block unauthorized systems from connecting to sensitive APIs.

Example

Example: Only approved services can call an internal API using mTLS.