Episode 44 — Protect Data at Rest Using Encryption, Key Custody, and Access Patterns

This episode teaches how to protect data at rest so theft of media or unauthorized access does not automatically become disclosure, connecting exam objectives across encryption, key management, and system security design. You will learn how to classify data stores such as disks, databases, backups, and snapshots, then choose encryption scope at the volume, file, or application layer based on threat model and operational constraints. We emphasize key custody and access patterns, showing why broadly accessible keys defeat encryption, and how least privilege, separation of duties, and monitoring of decryption events reduce insider and attacker abuse. A scenario covers a stolen laptop and contrasts outcomes when keys are protected versus embedded in endpoints, then extends to enterprise systems where shared service accounts and poor rotation practices create hidden exposure. Troubleshooting considerations include verifying encryption is actually enabled, coordinating key rotation without breaking dependent services, and building evidence for audits and incident investigations that proves encryption and key controls operate as intended. Produced by BareMetalCyber.com, where you’ll find more cyber audio courses, books, and information to strengthen your educational path. Also, if you want to stay up to date with the latest news, visit DailyCyber.News for a newsletter you can use, and a daily podcast you can commute with.