OS X Mountain Lion: If you forget your login password and FileVault is on
If you forget your login password, an administrator can reset the login password for your account. You can also reset your password if you have an Apple ID associated with your account. However resetting your password will also reset your keychain, and you will need to authenticate again to access any of the items that were stored in your keychain.
Have an administrator reset the login password
Use the Apple ID associated with the user to reset the password.
Use the recovery key to reset the login password
- Retrieve the recovery key you copied down when you turned on FileVault disk encryption.
If you cannot find your recovery key but stored it with Apple, contact Apple Support.
- Restart the computer.
- On the login screen, click on the account to unlock and reset the login password.
- In the password field, click on the Help button (?). If you created a password hint, it’s displayed. If you remember your password, enter it now.
- If you still need to reset your password, click the bottom line “reset it using your Recovery Key,” and then enter your recovery key.