Discussion
Assertion (A): Destroying a key can be an effective way of rendering data unrecoverable.
Reason (R): Data encrypted with a destroyed key cannot be decrypted by anyone afterwards.
Answer: B
Both are true and the reason gives the mechanism, and this is the basis of crypto-shredding as an approach to deletion where the storage itself cannot be reliably erased. It also makes accidental key destruction a serious risk.
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