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You can turn on EFS for an individual file by using My Computer in the same way that you apply encryption to a folder. However, when you encrypt a single file, the following warning appears: You have chosen to encrypt a file that is not in an encrypted folder. The file can become decrypted when it is modified. If you select the Always encrypt only the file check box, the warning no longer appears and EFS encrypts only the file that you select. To decrypt a file or folder by Using My Computer 1. Right-click the file or folder, and then click Properties. 2. Click Advanced, and then clear the Encrypt contents to secure data check box. This causes EFS to decrypt the selected folder and mark it as unencrypted. When you apply your choice, you also have the option to decrypt all files and subfolders in the folder.

Part III:

Microsoft Visual C# 2008 Express Edition: Build a Program Now!

In addition to using a firewall, you might want to simply use TCP/IP filtering to protect your Windows XP computer. TCP/IP filtering gives you the ability to allow specific TCP and UDP ports or IP protocol numbers to connect to your computer. To configure TCP/IP filtering for a network connection, follow these steps:

In Windows XP and later, anyone who has permissions to change the attributes of a folder can clear the Encrypt contents to secure data check box in the folder properties. For more information, see article 821737, A User Who Has Permissions to Change the Folder Attributes Can Now Change the Folder Encryption Attribute, in the Microsoft Knowledge Base at http://support.microsoft.com.

You can encrypt and decrypt folders or files by using the Cipher.exe command-line utility. Table 18-3 lists some of the parameters for the tasks that you can perform by using the cipher command. For a full list of parameters available, type cipher / at a command prompt. Note You can use wildcard characters and multiple parameters with the cipher command. A space is required between multiple parameters.

Parameter(s) Use the cipher command with no parameters or with the name of a specific file or folder. /e /e /a /d /d /a /

Open Network Connections. You can also open Network Connections from Control Panel or the Start menu.

Set the encryption attribute for folders in the current directory. Encrypt files in the current directory. Remove the encryption attribute from folders in the current directory. Decrypt files in the current directory. Display all the options available with cipher.

In the following example, a folder called project docs is encrypted and decrypted. Cipher project docs displays the status as U or unencrypted. Cipher /e project docs encrypts the folder. Cipher /d decrypts the folder.

2 Right-click your network icon in Network Connections, and choose Properties from the shortcut menu to open the dialog box shown here.

X:\>cipher "project docs" Listing X:\ New files added to this directory will not be encrypted. U Project docs X:\>cipher /e "project docs" Encrypting directories in X:\ Project docs [OK] 1 directorie(s) within 1 directorie(s) were encrypted.

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X:\>cipher "project docs" Listing X:\ New files added to this directory will not be encrypted. E Project docs X:\>cipher /d "project docs" Decrypting directories in X:\ Project docs [OK] 1 directorie(s) within 1 directorie(s) were decrypted. X:\>cipher "project docs" Listing X:\ New files added to this directory will not be encrypted. U Project docs

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Some organizations might choose to enable EFS on the shortcut menu. Encrypt and Decrypt are then available when a user right-clicks a file or folder in My Computer. To enable EFS options on the shortcut menu by editing the registry 1. In the Run dialog box, type regedit.exe. 2. Navigate to the subkey HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft \Windows\CurrentVersion\Explorer\Advanced. 3. On the Edit menu, point to New, and then click DWORD Value. 4. Enter EncryptionContextMenu for the value name, and 1 for the value data. This change takes effect the next time My Computer is opened. When the user right-clicks a file or folder on an NTFS volume, the option to encrypt or decrypt appears on the shortcut menu. Caution