At Rest Encryption
There are many steps you can take to harden a computer, and a common recommendation you'll see in hardening guides is to enable disk encryption. Disk encryption also often is referred to as "at rest encryption", especially in security compliance guides, and many compliance regimes, such as PCI, mandate the use of at rest encryption. This term refers to the fact that data is encrypted "at rest" or when the disk is unmounted and not in use. At rest encryption can be an important part of system-hardening, yet many administrators who enable it, whether on workstations or servers, may end up with a false sense of security if they don't understand not only what disk encryption protects you from, but also, and more important, what it doesn't.
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