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3 questions in Encryption.

Quiz

A regulator asks whether customer data is encrypted. The team says yes, disks are encrypted. Is that a sufficient answer?

A restricted column must be encrypted in the application before it reaches the database, and support staff must still look customers up by that exact value. 30 million rows and a p95 budget of 200 ms for the lookup. Which design?

Your database is encrypted at rest. An attacker obtains valid application credentials. What does the encryption protect against?