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Lesson 2: Using Encryption to Control Access to Data
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Figure 7-11 Turning off BitLocker
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Troubleshooting BitLocker Problems
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Several common BitLocker problems are actually features. The problems occur because BitLocker is designed to provide protection from specific types of attacks. Often, these legitimate uses resemble attacks and cause BitLocker to refuse to allow the computer to start or the BitLocker encryption to prevent you from accessing files:
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The operating system fails to start in a dual-boot configuration You can dual-boot a computer after enabling BitLocker. However, the second operating system instance must be configured on a different partition. You cannot dual-boot to a second operating system installed on the same partition.
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Dual-booting with BitLocker enabled
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Many people use BitLocker purely to protect Windows Vista from Windows XP If you dual-boot . between Windows XP and Windows Vista, Windows XP will erase the Windows Vista restore points and shadow copies. However, if you enable BitLocker for the Windows Vista partition (even if you then disable the security features), Windows XP won t touch the Windows Vista partition.
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The operating system fails to start if you move the hard disk to a different computer
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BitLocker is designed to protect data from offline attacks, such as attacks that bypass operating system security by connecting the hard disk to a different computer. The new computer will be unable to decrypt the data (even if it has a TPM chip in it). Before moving a BitLocker-encrypted disk to a different computer, disable BitLocker. Reenable BitLocker after transferring the disk. Alternatively, you can use the recovery key to start Windows after moving the hard disk to the new computer.
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7
Authenticating, Authorizing, and Auditing Access to Resources
The data on the hard disk is unreadable using standard disk recovery tools For the same
reasons stated in the previous bullet point, BitLocker files are unreadable using standard disk recovery tools. Someday recovery tools that support decrypting BitLocker files using a recovery key might be available. As of the time of this writing, your only opportunity for recovering BitLocker-encrypted files is to start Windows Vista using the BitLocker recovery key. For this reason it is very important to regularly back up BitLocker-encrypted volumes.
Practice: Encrypt and Recover Encrypted Data
In this practice, you simulate the recovery of a lost EFS encryption certificate.
Practice 1: Encrypt Data
In this practice, you encrypt a file. Windows Vista will automatically generate an EFS key if you don t already have one. 1. Log on to a Windows Vista computer as a standard user. 2. Create a file named Encrypted.txt in your Documents folder. 3. Right-click the Encrypted.txt file, and then click Properties. 4. In the General tab of the Properties dialog box, click the Advanced button. 5. Select the Encrypt Contents To Secure Data check box, and then click OK. Click OK again. 6. In the Encryption Warning dialog box, select Encrypt The File Only, and then click OK. Notice that Windows Explorer displays the Encrypted.txt file in green. 7. Double-click the Encrypted.txt file to open it in Notepad. Then, add the text This file is encrypted. Save the file and close Notepad. 8. Double-click the file to verify that you can open it, and then close Notepad again. Now you have encrypted a file, and no user can access it without your EFS key.
Practice 2: Back Up an EFS Key
In Practice 1, you encrypted a file. In this practice, you will back up the EFS key that was automatically generated when you encrypted the file. Then, you will delete the original key and determine whether you can access the EFS-encrypted file. To complete this practice, you must have completed Practice 1. 1. Click Start, and then click Control Panel. 2. Click the User Accounts link. Click the User Accounts link again. 3. In the left pane, click the Manage Your File Encryption Certificates link. The Encrypting File System Wizard appears.
Lesson 2: Using Encryption to Control Access to Data
4. On the Manage Your File Encryption Certificates page, click Next. 5. On the Select Or Create A File Encryption Certificate page, leave the default certificate (your EFS certificate) selected, and then click Next. 6. On the Back Up The Certificate And Key page, click the Browse button and select the Documents folder. For the filename, type EFS-cert-backup.pfx. Click Save. Then, type a complex password in the Password and Confirm Password fields. Click Next. 7. If the Update Your Previously Encrypted Files page appears, leave all check boxes cleared, and then click Next. 8. On the Encrypting File System page, click Close. 9. In Windows Explorer, open your Documents folder and verify that the EFS certificate was correctly exported. Now that you have backed up your EFS key, you can safely lose it. Simulate a corrupted or lost key by following these steps to delete it: 1. Click Start, type mmc, and then press Enter to open a blank Microsoft Management Console. 2. Click File, and then click Add/Remove Snap-in. 3. Select Certificates and click Add. Click OK. 4. Expand Certificates Current User, expand Personal, and then select Certificates. 5. In the middle pane, right-click your EFS certificate, and then click Delete. 6. In the Certificates dialog box, click Yes to confirm that you want to delete the certificate. 7. Log off the current desktop session, and then log back on. Windows Vista caches the user s EFS certificate. Thus, if you remained logged on, you would still be able to open your encrypted file. 8. Open the Documents folder and double-click the Encrypted.txt file. Notepad should appear and display an Access Is Denied error message. This indicates that the file is encrypted, but you don t have a valid EFS certificate.
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