Can I access a decrypted file if I have all the files backed up?

[Guest]

My situation is a bit different than some I've seen here. I got a new hard
drive and tried for days in vain to clone the old one. I kept getting errors.
Then, I was no longer able to boot my computer with the drive, but I had no
trouble accessing it in a different computer. I did a full backup of the
drive but naturally couldn't
back up system state data. I installed Windows on the new hard drive and ran
restore to restore my backup. I can't access the one 3kb .txt file that I had
encrypted. So I tried everything I could to get the old hard drive to boot on
the other computer. I did a Windows repair reinstall on it, which took all
night. When it finally booted, Explorer didn't run, but I accessed the file
through Notepad and attempted to decrypt it. I was logged on to my old user
account, but unfortunately, along the way, I had to recover old registry
files from when the computer was new. I used to have a password and probably
did when I encrypted the file. I know the password, so I have no trouble
logging on. But regardless of whether I had a password at the time, the user
account should have the same SID. Yet I still can't decrypt the file.

I restored the registry files from the backup, and I think the registry is
now current, but that didn't help. Then I restored the Windows files from
the backup, and now I'm back to square 1--it won't boot either computer. And
the worst part is that I had to activate Windows after doing the repair
install before I could even log on, so I expect to have trouble with my valid
use of the product key on the opther computer.

Is there a way to retrieve the certificate and encryption key from the files
on the hard drive, all of which I have?

Rojo26

 

[GreenieLeBrun]

My situation is a bit different than some I've seen here. I got a new
hard drive and tried for days in vain to clone the old one. I kept
getting errors. Then, I was no longer able to boot my computer with
the drive, but I had no trouble accessing it in a different computer.
I did a full backup of the drive but naturally couldn't
back up system state data. I installed Windows on the new hard drive
and ran restore to restore my backup. I can't access the one 3kb .txt
file that I had encrypted. So I tried everything I could to get the
old hard drive to boot on the other computer. I did a Windows repair
reinstall on it, which took all night. When it finally booted,
Explorer didn't run, but I accessed the file through Notepad and
attempted to decrypt it. I was logged on to my old user account, but
unfortunately, along the way, I had to recover old registry files
from when the computer was new. I used to have a password and
probably did when I encrypted the file. I know the password, so I
have no trouble logging on. But regardless of whether I had a
password at the time, the user account should have the same SID. Yet
I still can't decrypt the file.

I restored the registry files from the backup, and I think the
registry is now current, but that didn't help. Then I restored the
Windows files from the backup, and now I'm back to square 1--it won't
boot either computer. And the worst part is that I had to activate
Windows after doing the repair install before I could even log on, so
I expect to have trouble with my valid use of the product key on the
opther computer.

Is there a way to retrieve the certificate and encryption key from
the files on the hard drive, all of which I have?

Rojo26

I cann't answer your question as I do not use EFS but the following links
have help you.

The Encrypting File System
http://www.microsoft.com/technet/security/topics/cryptographyetc/efs.mspx

Best practices for the Encrypting File System
http://support.microsoft.com/kb/223316/en-us

How to back up the recovery agent Encrypting File System (EFS) private key
in Windows Server 2003, in Windows 2000, and in Windows XP
http://support.microsoft.com/kb/241201

How To Encrypt a Folder in Windows XP
http://support.microsoft.com/?id=308989

How To Remove File Encryption in Windows XP
http://support.microsoft.com/?id=308993

How To Encrypt a File in Windows XP
http://support.microsoft.com/?id=307877

HOW TO: Share Access to an Encrypted File in Windows XP
http://support.microsoft.com/?id=308991

 

[Guest]

I appreciate your taking the trouble to look up all those articles up for me,
but I have read them already, and none of them addresses recovery from a hard
drive that won't boot.

Thanks again for your efforts.

 

[GreenieLeBrun]

I appreciate your taking the trouble to look up all those articles up
for me, but I have read them already, and none of them addresses
recovery from a hard drive that won't boot.

Thanks again for your efforts.

***************SNIP SNIP**********************

Did you create a Recovery agent before you encrypted the files and did you
export your certificate and private key?

 

[Guest]

If I had, certainly after reading those articles, I wouldn't have made that
post. Windows gave no message at all saying that encryption even involved
certificates or keys.

What I need to know is if there is any possiblity that I can retrieve the
certificate and key from the hard drive.

 

[Shenan Stanley]

If I had, certainly after reading those articles, I wouldn't have
made that post. Windows gave no message at all saying that
encryption even involved certificates or keys.

What I need to know is if there is any possiblity that I can
retrieve the certificate and key from the hard drive.

While there may be some possibility - it is slim. I am sorry you did not
learn about encryption and the best practices for using it before diving
into it - as it may have sealed the fate of any encrypted files you have on
the unbootable hard disk drive.

One of the things encrypting your files was meant to protect against is
booting from something other than the system and copying/accessing the files
contained within the actual drive with the interesting data. Although your
predicament does not exactly match that scenario (you are reportedly trying
to access your own data because of a hard disk failure or something else
that made said system non-accessible by the means you were used to) - it
does bear a striking resemblance to "booting from something other than the
system and copying/accessing the files contained withing the actual drive
with the interesting data..." :-(

I am unsure what attempting a repair install might do (or even attempting to
image/clone the defunt system from the dying drive to a new drive and then
performing a repair install) and it COULD make things worse. However - if
it was me and this data was unbelievably important (and for some reason -
not backed up) - I would likely make a clone of the drive and try a repair
install on the cloned drive to get it back up and running to see if I could
access the data within. After that - you'd likely have to go with
non-microsoft products/services and spend a good hunk of money to try and
get the files decrypted.

For the future - if you plan on continuing to utilize EFS...

How to back up the recovery agent Encrypting File System (EFS) private key
in Windows Server 2003, in Windows 2000, and in Windows XP
http://support.microsoft.com/kb/241201

 

[Guest]

You seem to be thinking just like me. I got into this situation by trying to
clone the drive in the first place. I needed more disk space and a better
performing drive, so I was trying to clone the 40GB drive with a 2MB cache to
a 250GB drive with a 16MB cache. That failed over and over again even though
the source drive was still able to boot. But then I ran a drive restoration
program on it. That program is well known to save drives with problems. But
after I used it, I was not only unable to clone it, but I was unable to boot
it as well. So now that it is in much worse condition than it was then, I am
certianly not going to be able to clone it.

As an A+ tech, I have run repair installs before. I don't believe they
affect user account SIDs, and I know that they leave the folder and file
attributes intact.

By the way, all my data was backed up; I just never tried to open the one
text file that was encrypted--it contains all of my passwords and similar
information. I don't remember the circumstances in which I created that file,
but it is in a real oddball folder. It is in Docs & Settings\All
Users.WINDOWS\Documents. I have no idea how that "user account" ever got
created. I have a perfectly good All Users folder, but the All Users.WINDOWS
folder is a real oddity. Consequently, I almost never saw the file in its
folder--I accessed it from a shortcut.

Something else that is interesting: everyone has been saying that EFS is so
effective, but today, I discovered a copy of the file that I made last
August. I had copied the file over the network to my laptop, and the copy is
not encrypted. I have made quite a few changes and additions to it in the
last 11 months, but that copy might solve most of my problems. As of now,
it's too early to tell.

I want to try one more thing, although I give it almost no chance of
working. I want to format a healthy drive as NTFS and use a second computer
to restore all the files from the affected hard drive to it from my Windows
backup file. Although that drive won't be created from an image (sounds
almost Biblical, doesn't it?), it will have ntdetect.com, boot.ini, ntldr,
and all the Windows, program, registry, and user account files. It seems to
me that it should at least boot, especially if I use Windows Disk Management
to make it active. Whether it will have valid user accounts is another story,
and whether I'll be able to copy the file over the network again is another
story also.

I was thinking of using Partition Magic to change the drive format to FAT32
in hopes that it would remove encryption, but my guess is that I'd be able to
open the file only to see encrypted data that I won't be able to read. After
all, without the cert and key, it shouldn't be able to be decrypted. Biut
somehow when I copied it over the network, it lost its encryption. But when I
did the Windows backup over the network, the encryption stayed.

Joel

 

[Guest]

OK, I think I can do it. It turns out that I still have all the system
restore point folders in my System Volume Information folder. The last day I
modified the encrypted file was June 23, 2007. I have a restore point from
June 24. All I should have to do is follow the instructions in KB307545
(http://support.microsoft.com/kb/307545/) for modifying the registry so that
I would be able to run System Restore to restore back to that restore point.
The registry file from the restore point should include the user SID, the
certificate info, and the key info, thereby replicating exactly (except for
the hard drive) the conditions under which I could read the file.

I envision doing this on a borrowed, used hard drive on which I would
restore all the files from the backup. As long as I don't have a problem that
requires me to activate Windows, I think this would work. Any opinions?

Rojo26