Encryption is the process of converting data into a code to prevent unauthorized access. In Windows, this can be achieved using built-in tools that allow you to encrypt files and folders, ensuring that only individuals with the correct decryption key can access the contents.
Note:Â File encryption is not available in the Home edition of Windows.
To encrypt a file or folder:
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Right-click a file or folder and select  Properties
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Select the Advanced...
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Select the Encrypt contents to secure data check box
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Select OK to close the window, select Apply, and then select OK
