Correct, though it still is saved somewhere. Just like how TPMs in Computers can be exploited as well, this also can be. What I meant in my original comment was that the emergency mode did not clear that hardware chip’s storage, which others said otherwise.
Ah. Then yeah, emergency mode won’t suffice for protecting the full contents of the disk.
I can’t say Apple actually does this, but it is possible to protect important data by further encrypting user data with a separate encryption key derived from the passcode, and then clearing the key whenever the screen is locked.
That’s not how disk encryption works. Data in storage is always encrypted. That’s the whole point. When an app requests data, it is decrypted on the fly. Decrypted data is never stored outside of RAM.
Correct, though it still is saved somewhere. Just like how TPMs in Computers can be exploited as well, this also can be. What I meant in my original comment was that the emergency mode did not clear that hardware chip’s storage, which others said otherwise.
edit: corrected mistake according to ethan
Ah. Then yeah, emergency mode won’t suffice for protecting the full contents of the disk.
I can’t say Apple actually does this, but it is possible to protect important data by further encrypting user data with a separate encryption key derived from the passcode, and then clearing the key whenever the screen is locked.
That’s not how disk encryption works. Data in storage is always encrypted. That’s the whole point. When an app requests data, it is decrypted on the fly. Decrypted data is never stored outside of RAM.