The File Encryption Key (FEK) is encrypted with the EFS public key and is added to the file as an EFS attribute that is named Data Decryption Field (DDF). EFS uses an encryption key that is dynamically generated to encrypt the file. You can use EFS to encrypt data files to prevent unauthorized access. You can use the recovery agent's private key to recover data in situations when the copy of the EFS private key that is located on the local computer is lost. ![]() This article describes how to back up the recovery agent Encrypting File System (EFS) private key in Windows Server 2003, in Windows 2000, in Windows XP, in Windows Vista, in Windows 7, in Windows Server 2008, and in Windows Server 2008 R2. This article contains information about how to use the Certificate Export Wizard to export the recover agent's private key from a computer that is a member of a workgroup, and from a Windows Server 2003-based, Windows 2000-based, Windows Server 2008-based or Windows Server 2008 R2-based domain controller. Use the recovery agent's private key to recover data in situations when the copy of the EFS private key that is located on the local computer is lost. ![]() This article describes how to back up the recovery agent Encrypting File System (EFS) private key on a computer.Īpplies to: Windows 7 Service Pack 1, Windows Server 2012 R2 Original KB number: 241201 Summary
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