Individual skill

kms-pro

Design key management with KMS/HSM — envelope encryption, key hierarchy, rotation, and access governance.

skills/kms-pro/SKILL.md

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## Overview

Encryption is only as strong as key management. KMS (Key Management Service) and HSM (Hardware Security Module) practice answers: where keys live, who can use them, how they rotate, and what happens when they are compromised. Done right, a stolen database is unreadable; done wrong, the key sits next to the lock.

This skill covers key-management architecture: envelope encryption, key hierarchies, rotation, separation of duties, and the operational realities (backup, disaster recovery, cost) teams forget until they matter.

Key management is the rare security domain where the failure mode is total and silent: lose the keys and the data is gone; leak the keys and the encryption was theater. Both failures are operational, not cryptographic — which is why the boring parts (backup drills, access reviews, rotation automation) matter more than algorithm choice.

## When to use

- Designing encryption for data at rest (databases, object storage, backups).
- Choosing between cloud KMS, self-managed vault, and HSM.
- Implementing envelope encryption in applications.
- Planning key rotation, compromise response, and multi-region key strategy.