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The two main use cases are [[Data at rest]] protection, and Cryptographic Disk Erasure.
For Data at rest protection a computer or laptop is simply powered off. The disk now self-protects all the data on it. The data is safe because all of it, even the OS, is now encrypted, with a secure mode of [[Advanced Encryption Standard|AES]], and locked from reading and writing. The drive requires an authentication code which can be as strong as 32
==={{anchor|Crypto erase}}Disk sanitisation===
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