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EFS allows users to store confidential information about a computer when people who have physical access to your computer could otherwise compromise that information, intentionally or unintentionally. EFS is especially useful for securing sensitive data on portable computers or on computers shared by several users. Both kinds of systems are susceptible to attack by techniques that circumvent the restrictions of access control lists (ACLs). In a shared system, an attacker can gain access by starting up a different operating system. An attacker can also steal a computer, remove the hard drives, place the drives in another system, and gain access to the stored files. Files encrypted by EFS, however, appear as unintelligible characters when the attacker does not have the decryption key. Because EFS is tightly integrated with NTFS, file encryption and decryption are transparent. When users open a file, it is decrypted by EFS as data is read from disk. When they save the file, EFS encrypts the data as it is written to disk. Authorized users might not even realize that the files are encrypted because they can work with the files as they normally do. In its default configuration, EFS enables users to start encrypting files from My Computer with no administrative effort. From the user s point of view, encrypting a file is simply a matter of setting a file attribute. The encryption attribute can also be set for a file folder. This means that any file created in or added to the folder is automatically encrypted.

The following steps explain how EFS works. 1. EFS uses a public-private key pair and a per-file encryption key to encrypt and decrypt data. When a user encrypts a file, EFS generates a file encryption key (FEK) to encrypt the data. The FEK is encrypted with the user s public key, and the encrypted FEK is then stored with the file. 2. Files can be marked for encryption in a variety of ways. The user can set the encryption attribute for a file by using Advanced Properties for the file in My Computer, storing the file in a file folder set for encryption, or by using the Cipher.exe command-line utility. EFS can also be configured so that users can encrypt or decrypt a file from the shortcut menu accessed by right-clicking the file.

Trivial File Transfer Protocol (TFTP)

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3. To decrypt files, the user opens the file, removes the encryption attribute, or decrypts the file by using the cipher command. EFS decrypts the FEK by using the user s private key, and then decrypts the data by using the FEK.

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This section provides information about the components of Sysprep 2.0, including:

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The Sysprep.inf File The MiniSetup Wizard Factory mode Audit Boot mode Reseal mode The -msoobe parameter (Windows Welcome)

Using Sysprep.inf Listing 2-2 displays an example of a Sysprep.inf answer file. If you are running Sysprep with the -mini parameter, you can use the Sysprep.inf answer file to automate the MiniSetup process. It uses the same .inf file syntax and key names (for supported keys) as Unattend.txt. Place the Sysprep.inf file in the %SystemDrive%\Sysprep folder or on a floppy disk. If you use a floppy disk, insert it into the floppy disk drive after the Windows startup screen appears. Note that if you do not include Sysprep.inf when running Sysprep, the MiniSetup Wizard requires user input at each customization page. If you created a Sysprep.inf file on the reference computer and want to individually change Sysprep.inf on each destination computer, use the floppy disk method.

[Unattended] ; Prompt the user to accept the EULA. OemSkipEula = No ;Use Sysprep s default and regenerate the page file for the system ;to accommodate potential differences in available RAM. KeepPageFile = 0 ;Provide the location for additional language support files that ;might be required in a global organization. InstallFilesPath = c:\Sysprep\i386 [GuiUnattended] ;Set the time zone.

G Macro viruses. Macro viruses take advantage of the macro scripting facili-

Part I:

TimesZone = 20 ;Skip the Welcome screen when the system starts. OemSkipWelcome = 1 ;Do not skip the Regional and Language Options dialog box so that users can ;indicate which options apply to them. OemSkipRegional = 0 [UserData] ComputerName = XYZ_Computer1 [Display] BitsPerPel = 16 XResolution = 800 YResolution = 600 VRefresh = 60 [GuiRunOnce] "%systemdrive%\sysprep\filename.bat = path-1\Command-1.exe" "path-n\Command-n.exe" "%systemdrive%\sysprep\sysprep.exe -quiet" [Identification] ;Join the computer to the domain ITDOMAIN. JoinDomain = ITDOMAIN [Networking]