Discussion
Encryption at rest in a cloud storage service
Answer: B
Correct answer: protects the media but not a valid credential
Encryption at rest defends against the physical layer - a stolen or decommissioned disk, a mislaid backup. It does nothing against a request bearing valid credentials, because the service decrypts on the way out as a matter of course. Access control, key management and audit are what defend against that, which is why encryption at rest is a compliance baseline rather than a security strategy.
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