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How to Recover Data protected by BitLocker
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When you use BitLocker, the encrypted volumes will be locked if the encryption key is not available, causing BitLocker to enter recovery mode . Likely causes for the encryption key s unavailability include:
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Modification of one of the boot files . The BIOS is modified and the TPM is disabled . The TPM is cleared . An attempt is made to boot without the TPM, PIN, or USB key being available . The BitLocker-encrypted disk is moved to a new computer .
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After the drive is locked, you can boot only to recovery mode, as shown in Figure 16-19 . In recovery mode, you enter the recovery password using the function keys on your keyboard (just as you do when entering the PIN), pressing F1 for the digit 1, F2 for the digit 2, and so
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BitLocker Drive Encryption CHapTER 16 655
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forth, with F10 being the digit 0 . You must use function keys because localized keyboard support is not yet available at this phase of startup .
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FIgURE 16-19 Recovery mode prompts you for a 48-character recovery password .
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If you have the recovery key on a USB flash drive, you can insert the recovery key and press Esc to restart the computer . The recovery key will be read automatically during startup . If you cancel recovery, the Windows Boot Manager will provide instructions for using Startup Repair to fix a startup problem automatically . Do not follow these instructions because Startup Repair cannot access the encrypted volume . Instead, restart the computer and enter the recovery key .
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additionally, you can use the BitLocker Repair Tool, Repair-bde.exe, to help
recover data from an encrypted volume. If a BitLocker failure prevents Windows 7 from starting, you can run repair-bde from the Windows Recovery Environment (Windows RE) command prompt. For more information about repair-bde, run repair-bde / at a command prompt. For more information about troubleshooting startup problems, including using repair-bde, refer to 29.
How to Disable or Remove BitLocker Drive Encryption
Because BitLocker intercepts the boot process and looks for changes to any of the early boot files, it can cause problems in the following nonattack scenarios:
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Upgrading or replacing the motherboard or TPM Installing a new operating system that changes the MBR or the Boot Manager Moving a BitLocker-encrypted disk to another TPM-enabled computer Repartitioning the hard disk Updating the BIOS Installing a third-party update outside the operating system (such as hardware firmware updates)
CHapTER 16
Managing Disks and File Systems
To avoid entering BitLocker recovery mode, you can temporarily disable BitLocker, which allows you to change the TPM and upgrade the operating system . When you re-enable BitLocker, the same keys will be used . You can also choose to decrypt the BitLocker-protected volume, which will completely remove BitLocker protection . You can only re-enable BitLocker by repeating the process to create new keys and re-encrypt the volume . To disable or decrypt BitLocker, follow these steps:
1. 2. 3.
Log on to the computer as Administrator . From Control Panel, open BitLocker Drive Encryption . To temporarily disable BitLocker by using a clear key, click Suspend Protection and then click Yes . To disable BitLocker permanently, click Turn Off BitLocker and then click Decrypt Drive .
How to Decommission a BitLocker Drive permanently
Compromises in confidentiality can occur when computers or hard disks are decommissioned . For example, a computer that reaches the end of its usefulness at an organization might be discarded, sold, or donated to charity . The person who receives the computer might extract confidential files from the computer s hard disk . Even if the disk has been formatted, data can often be extracted . BitLocker reduces the risks of decommissioning drives . For example, if you use a startup key or startup PIN, the contents of the volume are inaccessible without this additional information or the drive s saved recovery information . You can decommission a drive more securely by removing all key blobs from the disk . By deleting the BitLocker keys from the volume, an attacker needs to crack the encryption a task that is extremely unlikely to be accomplished within anyone s lifetime . As a cleanup task, you should also discard all saved recovery information, such as recovery information saved to AD DS . To remove all key blobs on a secondary drive (data volume), you can format that drive from Windows or the Windows RE . Note that this format operation will not work on a drive that is currently in use . For example, you cannot use it to more securely decommission the drive used to run Windows . To remove all key blobs on a running drive, you can create a script that performs the following tasks:
1. 2.
Calls the Win32_EncryptableVolume.GetKeyProtectors method to retrieve all key protectors (KeyProtectorType 0) . Creates a not-to-be-used recovery password blob (discarding the actual recovery password) by using Win32_EncryptableVolume.ProtectKeyWithNumericalPassword and a randomly generated password sequence . This is required because Win32_EncryptableVolume.DeleteKeyProtector will not remove all key protectors . Uses Win32_EncryptableVolume.DeleteKeyProtector to remove all of the usable key protectors associated with the identifiers mentioned previously .
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