After turning on encryption with FileVault on my MacBook Air with Mountain Lion my login screen went gray. Is there a way to go back to the default one?
The grey one
The default one
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Nope, you can’t. When FileVault is enabled, the disk needs to be decrypted on every boot. As the computer can’t access files on the disk, It generates a simple login screen so that you can enter your password and decrypt the disk. This UI is hardcoded into the firmware of your computer, and can’t be changed.
When your Mac first starts up, EFI-boot takes over to decide what to do. It either
continues to bring up the system to the typical OSX login screen, which is managed by OSX's system preferences, or
it starts a special EFI pre-boot where it displays the FV2 unlock screen with the icons of designated OSX accounts approved to unlock the disk. Once you log on, the EFI unlock sequence carries forth your credentials, performing a single signon.
That's worked great for me:
OS X 10.8.2 included one important change to Apple’s fdesetup FileVault 2 management tool. fdesetup now has the authrestart verb, which allows a FileVault 2-encrypted Mac to restart and bypass the FileVault 2 pre-boot login screen. Instead, the Mac reboots as a unlocked system and goes straight to the regular login window.
When you run
sudo fdesetup authrestart, it asks for a password or recovery key. The password must be an account that has been enabled for FileVault 2 (i.e. an account that shows up at the FV2 pre-boot login screen.) After that, it puts an unlock key in system memory and reboots. On reboot, the reboot process automatically clears the unlock key from memory.
You can customise your login screen as shown in this post.