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[AD-Assurance] RE: BitLocker operational issues

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  • From: Ron Thielen <>
  • To: "" <>
  • Subject: [AD-Assurance] RE: BitLocker operational issues
  • Date: Sat, 8 Jun 2013 00:15:03 +0000
  • Accept-language: en-US
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Let me also be clear.  I am not saying that we shouldn’t point out that BitLocker may be reasonable for some institutions.  However as we used to say when presenting performance and capacity planning studies, YMMV (Your Mileage May Vary).  We should point that out as well.




From: [mailto:] On Behalf Of Ron Thielen
Sent: Friday, June 07, 2013 7:09 PM
Subject: [AD-Assurance] RE: BitLocker operational issues


That depends on the risk you’re mitigating and how BitLocker on the Hyper-V host actually worked, regarding which I have no clue.  For example, would that still means that sectors were only decrypted when the virtual machine when to read a VHD sector which needed to be brought in from physical disks.  It is sort of analogous to the question of whether using TPM protected disks is sufficient.  The answer is “it depends.”


In my case, since we have a sort of site license for VMWare, it isn’t relevant.  We aren’t going to use Hyper-V.  We actually found the links I cited by going to VMWare first and checking whether they supported BitLocker on VMs.




From: [] On Behalf Of Michael W. Brogan
Sent: Friday, June 07, 2013 4:40 PM
Subject: [AD-Assurance] RE: BitLocker operational issues


This link has a doc from MS that describes how to install Bitlocker on a Windows 2008 Hyper-V host.


The link you cited below says


“BitLocker does not support the encryption of VHDs, but does permit storage of VHDs on a BitLocker-protected drive.”




“BitLocker is not supported for use within a virtual machine. Do not run BitLocker Drive Encryption within a virtual machine. You can use BitLocker in the virtual machine management operating system to protect volumes that contain configuration files, virtual hard disks, and snapshots.”


So, just to understand better, is it the case that you can’t install Bitlocker in the tenant OS but it can be installed on the Hyper-V host? And, if the latter is true, wouldn’t the tenant benefit from the disk encryption provided by the host?





From: [] On Behalf Of Ron Thielen
Sent: Friday, June 07, 2013 11:59 AM
Subject: [AD-Assurance] BitLocker operational issues


I raised the question about BitLocker operational issues, because something was  nagging at the back of my mind.  I asked the Windows admins and they pointed me in the right direction.


It turns out that there is a significant issue that may affect some institutions.  BitLocker is not supported in virtual environments by either Microsoft or VMware.  We run some of our domain controllers on VMware VMs, so this is certainly an issue for us.



I guess we have to decide whether to move our VMs to physical hardware and lose the advantages that virtualization provides or submit an alternative means statement for RC4.





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