Hi there! You need software on your computer to "encrypt" your files. The dongle can be any USB flash drive that will be configured by the software to work as an Encryption Key. Once this is all setup, the USB key is needed to unencrypt your files when you turn the computer on (so works exactly as you say above). There is software built-in to some versions of Windows, called BitLocker, but doesn't come with all versions. E.g. it comes with Windows 10 Professional, but not Windows 10 Home. There
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