I am using a late-2010 MBA with Mountain Lion installed. I enabled Filevault 2 system encryption with a long key/password. When I close the lid on my MBA is goes into standby. When I open the lid the standard login menu is there. I type in my password and the laptop resumes. My question is, when the MBA is in standby mode and I have to login after opening the lid, is the system protected by the Filevault 2 encryption, or is it only effective when the laptop is powered down completely?