2 ms·

The SSD in a T2 Mac is encrypted in the same way that an iPhone is, so if the DFU crashes hard enough you’ll have to regenerate new keys and that’s equivalent t

The SSD in a T2 Mac is encrypted in the same way that an iPhone is, so if the DFU crashes hard enough you’ll have to regenerate new keys and that’s equivalent to drive zero. Glad it helped.

jplayer01 7y ago
Is it possible to export a recovery key? Because this kind of failure simply due to a bad update shouldn't be acceptable.
- ThePowerOfFuet 7y ago
  No.
- pvg 7y ago
  You get a recovery key when the original key is generated.
  - floatingatoll 7y ago
    Yes: You can export a FileVault recovery key when enabling FileVault, whether on a T2 Mac or not. No: There’s no opportunity to use FileVault recovery keys when you’re doing a DFU on a T2 Mac. If you have to DFU, your data is lost. (edited to clarify per reply)
    - pvg 7y ago
      That wasn't the question I was answering or was asked, I think.
- floatingatoll 7y ago
  No, it’s not possible to use a FileVault recovery key at this stage of repair. It’s not failure, it’s secure by design to prevent attackers/governments from stealing your files without consent. Under DFU brick and reset circumstances, the private key is gone, because otherwise an attacker could just upload a hacked firmware via DFU and access all your files. I assume the installer uses a different process that performs a DFU upgrade-in-place that safely manages the handoff using signed code and such, but that’s not the process we get as a last restore described above. If you don’t have off-device backups, you’re accepting the risk of losing all your data at any time due to any number of possible failures (software and hardware). Not much use getting upset about this specific case.
  - jplayer01 7y ago
    Not sure what DFU means as I'm not familiar with Mac. With any other encryption, it doesn't matter what the state of my system is. As long as I have the key, I can always decrypt it. And it's not a vulnerability. Without the key, the data is effectively inaccessible for everybody else (except maybe somebody with a quantum computer).

The SSD in a T2 Mac is encrypted in the same way that an iPhone is, so if the DFU crashes hard enough you’ll have to regenerate new keys and that’s equivalent to drive zero. Glad it helped.

jplayer01 7y ago

Is it possible to export a recovery key? Because this kind of failure simply due to a bad update shouldn't be acceptable.

ThePowerOfFuet 7y ago
No.
pvg 7y ago
You get a recovery key when the original key is generated.
- floatingatoll 7y ago
  Yes: You can export a FileVault recovery key when enabling FileVault, whether on a T2 Mac or not. No: There’s no opportunity to use FileVault recovery keys when you’re doing a DFU on a T2 Mac. If you have to DFU, your data is lost. (edited to clarify per reply)
  - pvg 7y ago
    That wasn't the question I was answering or was asked, I think.
floatingatoll 7y ago
No, it’s not possible to use a FileVault recovery key at this stage of repair. It’s not failure, it’s secure by design to prevent attackers/governments from stealing your files without consent. Under DFU brick and reset circumstances, the private key is gone, because otherwise an attacker could just upload a hacked firmware via DFU and access all your files. I assume the installer uses a different process that performs a DFU upgrade-in-place that safely manages the handoff using signed code and such, but that’s not the process we get as a last restore described above. If you don’t have off-device backups, you’re accepting the risk of losing all your data at any time due to any number of possible failures (software and hardware). Not much use getting upset about this specific case.
- jplayer01 7y ago
  Not sure what DFU means as I'm not familiar with Mac. With any other encryption, it doesn't matter what the state of my system is. As long as I have the key, I can always decrypt it. And it's not a vulnerability. Without the key, the data is effectively inaccessible for everybody else (except maybe somebody with a quantum computer).