Windows

Question

How to do in-place decryption of a BitLocker filesystem from a recovery CD?

By shachter ·
Tags: Windows
How does one do in-place decryption of a BitLocker filesystem from a recovery CD? In principle, it must be possible to do this. When I boot the system, I am not asked to type in a decryption key; therefore, the BitLocker decryption key must be already on the disk somewhere. There is a systemrescue CD that boots into a Linux system with numerous utilities; one of them -- "dislocker" is its name, if I recall correctly -- offers to decrypt a BitLocker fs and copy the decrypted fs somewhere else. I don't want that; I want to do in-place decryption. This is possible after you log in (I know, because I have done it in the past, although I don't right now recall exactly how); I just need to know how to do it from a recovery CD. I have "Bob Omd's Modified Win10PE recovery disk" (which does not fit on a CD, so I put it on a DVD), but when I try, after booting it, to decrypt the C: device, it asks for a 48-bit number, which in my case I have not got, and which should not be needed. I have not tried Trinity, although I have used it in the past, because I believe it is old and does not support UEFI (please correct me if I am wrong) and in any event I do not recall that it has any BitLocker capabilities. I have not tried HirenBootCd because it too (despite its name) does not fit on a CD, and DVDs are scarce resources, so at this point I wanted to ask you for your advice. Thank you in advance for any and all replies. jay at m5 dot chicago dot il dot us
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All Answers

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Back to the person/IT that created this.

by rproffitt Moderator In reply to How to do in-place decryp ...

This is a system which is created by someone. Ask them for the procedure.

As to the 48 bit number, it's noted how you get it at https://support.microsoft.com/en-us/windows/finding-your-bitlocker-recovery-key-in-windows-10-6b71ad27-0b89-ea08-f143-056f5ab347d6

Sometimes owners dismiss the need for backups and keeping necessary data for repair of file systems. You nod a lot and then wipe the drive after they figure out how lost they are.

PS. DVD media looks to be in stock many places. However I tend to use USB memory sticks for such things. So much so our office buys them in bulk.

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Worth another reply.

by rproffitt Moderator In reply to How to do in-place decryp ...

As to your demand "offers to decrypt a BitLocker fs and copy the decrypted fs somewhere else. I don't want that; I want to do in-place decryption."

When dealing with data recovery, you have to again nod a lot and then move to what works to get the data out. Sometimes a client is their own worst enemy.

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