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BitLocker is not a replacement for the EFS introduced in Windows 2000, but it is a supplement to the EFS that ensures that the operating system itself is protected from attack . Best practices for protecting sensitive computers and data will combine the two features to provide a high level of assurance of the data integrity on the system . EFS continues to be an important data-integrity tool in Windows 7 . EFS allows the encryption of entire volumes or individual folders and files and can support multiple users using the same computer, each with protected data . Additionally, EFS allows multiple users to have secure access to sensitive data while protecting the data against unauthorized viewing or modification . EFS cannot be used to encrypt system files, however, and it should be combined with BitLocker to encrypt the system drive where sensitive data must be protected . EFS is susceptible to offline attack using the SYSKEY, but when you combine EFS with BitLocker to encrypt the system volume, this attack vector is protected . EFS uses symmetric key encryption along with public key technology to protect files and folders . Each user of EFS is issued a digital certificate with a public and private key pair . EFS uses the keys to encrypt and decrypt the files transparently for the logged-on user . Authorized users work with encrypted files and folders just as they do with unencrypted files and folders . Unauthorized users receive an Access Denied message in response to any attempt to open, copy, move, or rename the encrypted file or folder .

Files are encrypted with a single symmetrical key, and then the symmetrical key is encrypted twice: once with the user s EFS public key to allow transparent decryption and once with the recovery agent s key to allow data recovery . The sections that follow describe how to manage EFS keys . For general information about EFS, read Encrypting File System in Windows XP and Windows Server 2003 at http://technet.microsoft.com/en-us/library/bb457065.aspx .

To prevent being unable to access an encrypted file, you can export your personal certificate . When you export your certificate, you can then copy or move the encrypted file to another computer and still access it by importing the certificate you exported . To export your personal certificate, follow these steps:

1. 2. 3. 4. 5. 6. 7. 8. 9.

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Open Windows Explorer and select a file that you have encrypted . Right-click the file and then select Properties . Click Advanced on the General tab . Click Details on the Advanced Attributes tab to open the User Access dialog box . Select your user name and then click Back Up Keys to open the Certificate Export Wizard . Click Next to select the file format to use . Click Next and enter a password to protect the key . Repeat the entry and then click Next . Enter a path and filename to save the file to, or browse for a path . Click Next . Click Finish to export the certificate and then click OK to confirm that it was saved successfully .

You can share encrypted files with other users if you have the certificate for the other user . To allow another user to use a file that you have encrypted, you need to import her certificate onto your computer and add her user name to the list of users who are permitted access to the file . To import a user certificate, follow these steps:

1. 2. 3. 4.

Click Start, type mmc, and then press Enter to open a blank Microsoft Management Console (MMC) . Click File and then click Add/Remove Snap-in . Select Certificates and click Add . Select My User Account and click Finish . Click OK to close the Add Or Remove Snap-in dialog box . Click Certificates and then double-click Trusted People .

5. 6. 7. 8. 9. 10. 11.

Under Trusted People, right-click Certificates . On the All Tasks menu, click Import to open the Certificate Import Wizard . Click Next and then browse to the location of the certificate you want to import . Select the certificate and then click Next . Type the password for the certificate and then click Next . Click Next to place the certificate in the Trusted People store . Click Finish to complete the import . Click OK to acknowledge the successful import and then exit the MMC .

When you have a user s certificate, you can add that user to the list of users who have access to a file . A user s certificate will be on a computer automatically if the user has logged on to the computer previously . To add a user whose certificate you have imported to the users who can access a file, follow these steps:

1. 2. 3. 4. 5. 6. 7.

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