Concepts/9. Security & Auth/Mutual TLS (mTLS) Zero-Trust Authentication
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Mutual TLS (mTLS) Zero-Trust Authentication

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Both the client and the server authenticate each other using cryptographic X.509 certificates before establishing an encrypted tunnel.

STAFF ENGINEER TAKEAWAY: The bedrock of Zero-Trust microservice security: even if an attacker penetrates the internal VPC, they cannot send requests without a valid client certificate.
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