How do you check if a hard drive was encrypted with software or hardware when using BitLocker?

Question

Due to the recent security findings in that probably most SSDs implement encryption in a completely naive and broken way, I want to check which of my BitLocker machines are using hardware encryption and which ones are using software.

I found a way to disable the use of hardware encryption, but I can't figure out how to check if I'm using hardware encryption (in which case, I'll have to re-encrypt the drive). How do I do ti?

I'm aware of manage-bde.exe -status which gives me an output such as:

Disk volumes that can be protected with
BitLocker Drive Encryption:
Volume C: [Windows]
[OS Volume]

    Size:                 952.62 GB
    BitLocker Version:    2.0
    Conversion Status:    Used Space Only Encrypted
    Percentage Encrypted: 100.0%
    Encryption Method:    XTS-AES 128
    Protection Status:    Protection On
    Lock Status:          Unlocked
    Identification Field: Unknown
    Key Protectors:
        TPM
        Numerical Password

but I don't know if the information I want is in this screen.

Solution

There exists a pretty new article on MSRC, partially explaining the issue and how to solve it. Thanks @Kevin

Microsoft is aware of reports of vulnerabilities in the hardware encryption of certain self-encrypting drives (SEDs). Customers concerned about this issue should consider using the software only encryption provided by BitLocker Drive Encryption™. On Windows computers with self-encrypting drives, BitLocker Drive Encryption™ manages encryption and will use hardware encryption by default. Administrators who want to force software encryption on computers with self-encrypting drives can accomplish this by deploying a Group Policy to override the default behavior. Windows will consult Group Policy to enforce software encryption only at the time of enabling BitLocker.

To check the type of drive encryption being used (hardware or software):

1. Run manage-bde.exe -status from elevated command prompt.

2. If none of the drives listed report "Hardware Encryption" for the Encryption Method field, then this device is using software encryption and is not affected by vulnerabilities associated with self-encrypting drive encryption.

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manage-bde.exe -status should show you if hardware-encryption is used.

I don't have a HW encrypted drive ATM, so here is a reference link and the image it contains:

The BitLocker UI in Control Panel does not tell you whether hardware encryption is used, but the command line tool manage-bde.exe does when invoked with the parameter status. You can see that hardware encryption is enabled for D: (Samsung SSD 850 Pro) but not for C: (Samsung SSD 840 Pro without support for hardware encryption):

Comments

[Kevin]

@Nat: See this advisory for details. Incidentally, it also solves OP's problem.

[Pablo]

@Nat: I believe this is the source of the information: ru.nl/english/news-agenda/news/vm/icis/cyber-security/2018/…

[Maksim Shamihulau]

Additionally type of encryption can be specified via Local Group Policy docs.microsoft.com/en-us/windows/security/…. Configure use of hardware-based encryption for fixed data drives When not configured, Software encryption is used.