DataStructures / Cyber Security Interview Questions

Why should you rotate encryption keys periodically?

Rotating encryption keys means retiring an old key and replacing it with a new one on a regular schedule, even if there's no known compromise.

Limits how much data is exposed if a key is ever silently compromised, since only data encrypted under that specific key window is at risk
Reduces the amount of ciphertext available for cryptanalysis against any single key
Supports compliance requirements that mandate periodic key rotation, such as PCI-DSS
Makes it easier to cleanly revoke access for a former employee or partner

Key rotation needs to be paired with a re-encryption or key-versioning strategy so that data encrypted under a retired key can still be decrypted when needed, usually managed through a dedicated key management service (KMS).

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What does key rotation limit if a key is silently compromised? The exposure to only that key's data window

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Nothing, rotation has no effect

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Only physical access to servers

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What is typically used to manage key rotation and versioning? A key management service (KMS)

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A basic text file on a laptop

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A public DNS record

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DataStructures / Cyber Security Interview Questions

Why should you rotate encryption keys periodically?

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