Any individual or app that doesn’t possess the appropriate file encryption key cannot open any encrypted files and folders. With EFS, it is possible to enable transparent encryption and decryption of files for your user account by using advanced, standard cryptographic algorithms. By default, EFS is a built-in encryption tool in every Windows Operating System used to encrypt files and folders on NTFS drives to protect them from unwanted access. EFS enables files to be transparently encrypted to protect confidential data from attackers with physical access to the computer. When files or folders are encrypted with EFS, only an individual user with an authorized recovery agent can decrypt it. The Encrypting File System (EFS) is a feature of the Windows 2000 operating system that gives you the opportunity to store files and folders in an encrypted form.
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