Instead, they see a warning message like access denied, depending on the application trying to access the file or its data. Users who are not authorized cannot open, copy, rename or move the encrypted file or folder. When they save the file, encryption is reapplied to the file to maintain its cryptographic protection. ![]() The system automatically decrypts the file or folder when the authorized user accesses it. The file remains encrypted if it is moved to another folder or even a different hard drive. Once a file is marked for encryption, EFS runs in the background without disrupting the user. However, users can opt out of automatic encryption by selecting a custom setting called This file only. When a folder is marked encrypted, future files transported to that folder are also encrypted and automatically protected. The files are encrypted when they are closed and are automatically ready to use once they are opened. At the same time, users can also select and encrypt individual files. This ensures that all files added to the encrypted folder are automatically encrypted. The typical method of using EFS is to perform encryption at the folder level. EFS explainedĮFS is a user-based encryption control technique that enables users to control who can read the files on their system. Instead, they see a warning message depending on the application trying to access the file and its data. ![]() Unauthorized users cannot open the files. EFS also ensures that only authorized users or intended recipients can decrypt the file, which they can with just a click of the button.Īdditional users such as administrators can also access these encrypted files, but to do this, they need the right permissions. The ultimate aim of EFS is to encrypt files on hard drives from unauthorized intruders who get access to authorized users' physical software. NTFS itself is a built-in system used to store and retrieve files.
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