Difference between revisions of "BitLocker Disk Encryption"

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'''BitLocker Disk Encryption''' is a [[Microsoft]] [[Full Volume Encryption]] solution first included with the Enterprise and Ultimate editions of [[Windows|Windows Vista]].  
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'''BitLocker Disk Encryption''' (BDE) is [[Full Volume Encryption]] solution by [[Microsoft]] first included with the Enterprise and Ultimate editions of [[Windows|Windows Vista]]. It is also present in [[Windows|Windows 7]] along with a system for encrypting removable storage media devices, like [[USB]], which is called BitLocker To Go. Unlike previous versions of BitLocker, BitLocker To Go allows the user to protect volumes with a password or smart card.
  
== Indicator ==  
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== BitLocker ==
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Volumes encrypted with BitLocker will have a different signature than the standard [[NTFS]] header. Instead, they have in their volume header (first sector): <tt>2D 46 56 45 2D 46 53 2D</tt> or, in ASCII, <tt>-FVE-FS-</tt>.
  
Drives protected with BitLocker will have a different signature than the standard [[NTFS]] header. Instead, they have in their first sector: <pre>EB 52 90 2D 46 56 45 2D 46 53 2D</pre> or, in ASCII, <pre>eR -FVE-FS-</pre>
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These volumes can be identified by the BitLocker GUID/UUID: 4967d63b-2e29-4ad8-8399-f6a339e3d00.
  
== Algorithm ==
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The actual data on the encrypted volume is protected with either 128-bit or 256-bit [[AES]] and optionally diffused using an algorithm called Elephant. The key used to do the encryption, the Full Volume Encryption Key (FVEK) and/or TWEAK key, is stored in the BitLocker metadata on the protected volume. The FVEK and/or TWEAK keys are encrypted using another key, namely the Volume Master Key (VMK). Several copies of the VMK are also stored in the metadata. Each copy of the VMK is encrypted using another key, also know as key-protector key. Some of the key-protectors are:
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* TPM (Trusted Platform Module)
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* Smart card
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* recovery password
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* start-up key
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* clear key; this key-protector provides no protection
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* user password
  
The program uses either 128 or 256 [[AES]] with an elephant diffuser. See the links section for full details.
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BitLocker has support for partial encrypted volumes.
  
== Recovery Keys ==
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== BitLocker To Go ==
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Volumes encrypted with BitLocker To Go will have a hybrid encrypted volume, meaning that part of the volume is unencrypted and contains applications to unlock the volume and the other part of the volume is encrypted. The "discovery drive" volume contains BitLocker To Go Reader to read from encrypted volumes on versions of Microsoft [[Windows]] without BitLocker support.
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== manage-bde ==
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To view the BitLocker Drive Encryption (BDE) status on a running Windows system:
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<pre>
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manage-bde.exe -status
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</pre>
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To obtain the recovery password for volume C:
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<pre>
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manage-bde.exe -protectors -get C: -Type recoverypassword
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</pre>
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Or just obtain the all “protectors” for volume C:
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<pre>
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manage-bde.exe -protectors -get C:
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</pre>
  
 
== See Also ==
 
== See Also ==
[[BitLocker To Go]]
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* [[BitLocker:_how_to_image|BitLocker: How to image]]
[[Defeating Whole Disk Encryption]]
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* [[Defeating Whole Disk Encryption]]
  
 
== External Links ==
 
== External Links ==
  
* Conducting forensic analysis on BitLocker protected volumes was discussed in the paper [http://jessekornblum.com/publications/di09.html Implementing BitLocker for Forensic Analysis].
 
 
* [http://en.wikipedia.org/wiki/BitLocker_Drive_Encryption Wikipedia entry on BitLocker]
 
* [http://en.wikipedia.org/wiki/BitLocker_Drive_Encryption Wikipedia entry on BitLocker]
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* [http://www.nvlabs.in/nvbit_bitlocker_white_paper.pdf Accessing Bitlocker volumes from linux], by Nitin Kumar and Vipin Kumar, 2008
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* [http://jessekornblum.com/publications/di09.html Implementing BitLocker for Forensic Analysis], ''Digital Investigation'', by Jesse D. Kornblum, 2009
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* [https://googledrive.com/host/0B3fBvzttpiiSX2VCRk16TnpDd0U/BitLocker%20Drive%20Encryption%20(BDE)%20format.pdf BitLocker Drive Encryption (BDE) format specification], by the [[libbde|libbde project]], March 2011
 
* [http://technet2.microsoft.com/WindowsVista/en/library/c61f2a12-8ae6-4957-b031-97b4d762cf311033.mspx?mfr=true Microsoft's Step by Step Guide]
 
* [http://technet2.microsoft.com/WindowsVista/en/library/c61f2a12-8ae6-4957-b031-97b4d762cf311033.mspx?mfr=true Microsoft's Step by Step Guide]
 
* [http://technet.microsoft.com/en-us/windowsvista/aa906017.aspx Microsoft Technical Overview]
 
* [http://technet.microsoft.com/en-us/windowsvista/aa906017.aspx Microsoft Technical Overview]
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* [http://technet.microsoft.com/en-us/magazine/2009.05.win7.aspx An Introduction to Security in Windows 7]
 
* [http://www.microsoft.com/whdc/system/platform/hwsecurity/BitLockerFAQ.mspx Microsoft FAQ]
 
* [http://www.microsoft.com/whdc/system/platform/hwsecurity/BitLockerFAQ.mspx Microsoft FAQ]
 
* [http://www.microsoft.com/downloads/details.aspx?FamilyID=131dae03-39ae-48be-a8d6-8b0034c92555&DisplayLang=en Microsoft Description of the Encryption Algorithm]
 
* [http://www.microsoft.com/downloads/details.aspx?FamilyID=131dae03-39ae-48be-a8d6-8b0034c92555&DisplayLang=en Microsoft Description of the Encryption Algorithm]
 
* [http://secude.com/htm/801/en/White_Paper%3A_Cold_Boot_Attacks.htm Cold Boot Attacks, Full Disk Encryption, and BitLocker]
 
* [http://secude.com/htm/801/en/White_Paper%3A_Cold_Boot_Attacks.htm Cold Boot Attacks, Full Disk Encryption, and BitLocker]
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* [http://technet.microsoft.com/en-us/library/hh831412.aspx What's New in BitLocker] in Windows 8
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== Tools ==
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* [http://www.hsc.fr/ressources/outils/dislocker/ dislocker]
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* [[libbde]]
  
 
[[Category:Disk encryption]]
 
[[Category:Disk encryption]]
 
[[Category:Windows]]
 
[[Category:Windows]]

Revision as of 09:29, 8 September 2013

BitLocker Disk Encryption (BDE) is Full Volume Encryption solution by Microsoft first included with the Enterprise and Ultimate editions of Windows Vista. It is also present in Windows 7 along with a system for encrypting removable storage media devices, like USB, which is called BitLocker To Go. Unlike previous versions of BitLocker, BitLocker To Go allows the user to protect volumes with a password or smart card.

Contents

BitLocker

Volumes encrypted with BitLocker will have a different signature than the standard NTFS header. Instead, they have in their volume header (first sector): 2D 46 56 45 2D 46 53 2D or, in ASCII, -FVE-FS-.

These volumes can be identified by the BitLocker GUID/UUID: 4967d63b-2e29-4ad8-8399-f6a339e3d00.

The actual data on the encrypted volume is protected with either 128-bit or 256-bit AES and optionally diffused using an algorithm called Elephant. The key used to do the encryption, the Full Volume Encryption Key (FVEK) and/or TWEAK key, is stored in the BitLocker metadata on the protected volume. The FVEK and/or TWEAK keys are encrypted using another key, namely the Volume Master Key (VMK). Several copies of the VMK are also stored in the metadata. Each copy of the VMK is encrypted using another key, also know as key-protector key. Some of the key-protectors are:

  • TPM (Trusted Platform Module)
  • Smart card
  • recovery password
  • start-up key
  • clear key; this key-protector provides no protection
  • user password

BitLocker has support for partial encrypted volumes.

BitLocker To Go

Volumes encrypted with BitLocker To Go will have a hybrid encrypted volume, meaning that part of the volume is unencrypted and contains applications to unlock the volume and the other part of the volume is encrypted. The "discovery drive" volume contains BitLocker To Go Reader to read from encrypted volumes on versions of Microsoft Windows without BitLocker support.

manage-bde

To view the BitLocker Drive Encryption (BDE) status on a running Windows system:

manage-bde.exe -status

To obtain the recovery password for volume C:

manage-bde.exe -protectors -get C: -Type recoverypassword

Or just obtain the all “protectors” for volume C:

manage-bde.exe -protectors -get C:

See Also

External Links

Tools