For security concerns, I wonder how it would be possible for an OS X upgrade (e.g. from Mavericks to El Capitan), to reboot my Mac multiple times without asking me for my FileVault 2 password?
I mean, the whole drive is encrypted and even an OS X installer would not know the password after a reboot. In spite of that, it reboots one or more times without asking me for my password.
Therefore I suspect that Apple stores my password somewhere, either on disk, in NVRAM, or online, at least during the upgrade process. If so, wouldn't this be a serious security concern?
Can anyone shed a bit of light on this? How does it work?