For a seamless experience, Apple makes the FileVault login window look identical to the OS X Login Window (shown here).
Without this, these routines will not be able to access the OS X directory to change an account password. If you change your account password in the Users & Groups system preferences in OS X, then the FileVault EFI login password will be updated accordingly however, if you use alternative approaches like booting to the OS X Recovery partition to reset passwords, then there will be several blocks.įirst and foremost, you will be required to unlock an encrypted boot volume for these password resetting routines to work, which in itself requires knowledge of the encrypted drive's password. When you provide your login credentials at the EFI login prompt, these credentials first unlock the volume, and then are passed to OS X when it loads, allowing the system to immediately log into your account. The seamless aspect that Apple has built here is to mirror the OS X login window's look and feel, and then copy your account password to use for unlocking the disk.
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When the EFI login window appears, you are looking at a system that does not have OS X running in any way - the system software and all contents of the disk are still locked away and encrypted.Īt this point, the EFI login password is accepted to unlock the volume, and then OS X is allowed to boot and load system processes and user accounts, etc. This is because the FileVault login window is the EFI login process, and not the standard OS X login window.
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The classic password changing routine in OS X's Users & Groups system preferences will update the FileVault password accordingly, but alternative password changing routines may not do so. You can see this primarily in the timing of when the system boots-without FileVault the system will load a few background processes and take a second or two to display the login window, but with FileVault enabled the system will almost immediately show the login window. This prompt, which is stored on a separate hidden partition, looks like the standard OS X login window (with some nuance differences), but is a different process altogether. When you enable FileVault, the system will initially mirror your account password to the FileVault volume's EFI login prompt. The way OS X sets up these passwords to appear the same may seem a bit convoluted, but these passwords are in fact different and are treated differently by the system.
The password reset features Apple provides are for the account password in the operating system, and not for the FileVault password or encryption keys. Without FileVault enabled this is definitely the case, but if you have FileVault enabled these password reset routines will not work.
MacFixIt reader Fred recently wrote in with such a concern: If I have FileVault enabled on my Mac, what prevents someone from restarting with Command-R held down, and then use the "resetpassword" command to change the password and log into the system? However, given Apple supplies password resetting utilities that can change an administrative password even without being logged in, you might be concerned this will allow a bad guy to simply reset your password, bypass FileVault, and get to your encrypted files. FileVault is OS X's built-in data encryption technology, and when enabled, as with an unencrypted OS X volume you simply enter your account credentials to get into your system.
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