Which statement describes device encryption and examples of OS features?

Which statement describes device encryption and examples of OS features?

• A. Encryption protects data at rest; BitLocker (Windows) and FileVault (macOS) provide device encryption.
• B. Encryption protects data in transit.
• C. Antivirus software provides device encryption.
• D. BitLocker and FileVault are backup tools.

Answer: (A)

Device encryption protects the data stored on a device by making the entire disk unreadable without the proper key. This protects data at rest, meaning what’s on the drive when the device isn’t actively transmitting it. Built-in OS features like BitLocker for Windows and FileVault for macOS implement this protection by encrypting the whole drive and requiring a password or key to unlock it at startup. They may also use hardware support such as a TPM to safeguard the encryption keys. In contrast, encryption in transit protects data as it moves across networks, not on the device itself. Antivirus software doesn’t perform encryption, and BitLocker and FileVault aren’t backup tools — they don’t manage or create backups, they secure the stored data.

Device encryption protects the data stored on a device by making the entire disk unreadable without the proper key. This protects data at rest, meaning what’s on the drive when the device isn’t actively transmitting it. Built-in OS features like BitLocker for Windows and FileVault for macOS implement this protection by encrypting the whole drive and requiring a password or key to unlock it at startup. They may also use hardware support such as a TPM to safeguard the encryption keys. In contrast, encryption in transit protects data as it moves across networks, not on the device itself. Antivirus software doesn’t perform encryption, and BitLocker and FileVault aren’t backup tools — they don’t manage or create backups, they secure the stored data.