When setting up FileVault 2 on a computer, you're presented with 2 recovery options - storing the recovery key with your iCloud account / Apple ID, and displaying the recovery key (for you to write down / save somewhere yourself). However, after doing some research, I found some posts that claim to be able to extract FileVault recovery keys from users' iCloud accounts, which makes me wonder if storing the recovery key with iCloud is the best solution. For a point of reference, I also looked at Apple's whitepaper on FileVault, which explains that the recovery key is protected by a "wrapping" key generated by hashing the responses to 3 security questions. Still, if this exploit's legit, as far as I can tell this would only matter if someone had physical access to your computer.
Given these two recovery options, which would be more secure?
- Store recovery key with iCloud
- Store recovery key in a password manager, where it's synced to multiple devices via a service like Dropbox
I'm currently thinking option 2 would be, because there's the extra layer of the password manager vault even if the file syncing service were compromised, but that might be equivalent to the wrapping key hashing Apple adds.