Recover EFS key


  1. Posts : 28
    Windows 10 Enterprise 64-bit
       #1

    Recover EFS key


    Hi, I recently forgot to backup the EFS key from Win 1709 and upgraded my system parts and installed Win 20H2. Now I cannot open my encrypted files, they are not essential but would be pleased to try and retrieve them.

    Luckily,

    1) I have those files on my D:/ backup drive, which is not altered.
    2) I installed new system on a new disk, cpu, mobo. Which is, I have the old OS disk and system unaltered.

    So can I export the key without booting old disk? Or do I have to build the old system again, boot and get it (which I will eventually for my brother but will take time)?

    edit: I went for the latter (building old system again) and its all OK.
    Last edited by Xtreme512; 14 Aug 2021 at 17:06.
      My Computer


  2. Posts : 5,816
    Win 11 Pro (x64) 21H2
       #2

    For clarity what is an EFS key? Are you talking about BitLocker?
      My Computers


  3. Posts : 11,384
    Windows 10 Home x64 Version 21H2 Build 19044.1706
       #3
    Last edited by Try3; 18 Apr 2021 at 14:30.
      My Computer


  4. Posts : 28
    Windows 10 Enterprise 64-bit
    Thread Starter
       #4

    sygnus21 said:
    For clarity what is an EFS key? Are you talking about BitLocker?
    No not the bitlocker. I simply encrypted some files in properties -> secure the file, that is with using Encryption File System of Windows. And forgot to export the key for backup purposes.

    Try3 said:
    I believe that you have no option but to boot the old system in order to export its EFS key.

    Even though I have the old /users folder ready and the whole disk? Cant it be done without booting?
      My Computer


  5. Posts : 5,816
    Win 11 Pro (x64) 21H2
       #5

    Thanks for the clarity. I'll leave you with Try3

    Peace
      My Computers


  6. Posts : 11,384
    Windows 10 Home x64 Version 21H2 Build 19044.1706
       #6

    Xtreme512 said:
    Even though I have the old /users folder ready and the whole disk? Cant it be done without booting?
    Try3 said:
    I believe that you have no option but to boot the old system in order to export its EFS key.
    Denis
      My Computer


  7. Posts : 1,614
    Windows 10 Home
       #7

    Try3, EFS is married to a specific user account as well, correct? And, the Windows used in the creation of those files?
      My Computer


  8. Posts : 11,384
    Windows 10 Home x64 Version 21H2 Build 19044.1706
       #8

    RolandJS said:
    Try3, EFS is married to a specific user account as well, correct? And, the Windows used in the creation of those files?
    Roland,

    All is explained in the tutorials.

    Denis
      My Computer


 

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