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Last updated: April 29, 2026
Why this module. “Service A authenticates to service B with an API key in a header” — the dominant pattern, and the source of breaches when keys leak. mTLS replaces shared secrets with cryptographic identity. Operationally harder; cryptographically much stronger.
Why this module. “Service A authenticates to service B with an API key in a header” — the dominant pattern, and the source of breaches when keys leak. mTLS replaces shared secrets with cryptographic identity. Operationally harder; cryptographically much stronger.
Why bearer tokens fail
- Tokens leak via logs, errors, screenshots.
- Rotation requires coordination.
- Compromise window is the token lifetime.
- No protocol-level peer verification.
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