I was wondering if the DPAPI will still work properly if a user doesn't have a a login password (like most of the home users). I can't find this information on Google or in the official documentation and I can't test it because the computers at work can't be without a password.
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Yes, but it's not quite as secure. DPAPI encrypts data with a master key, which is independent of the user password. When the user has a password, the master key is encrypted with the user's password. Without a password, an attacker with local access (via another user account) might extract the master key. However, once an attacker has local access to the system it's game over anyway. DPAPI is just a damage limitation system, really.
answered Oct 15 '12 at 8:47
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1Smallish correction: the master key is encrypted using the account's RSA keys, which in turn are protected using the user's password. Still the same answer, though. – AviD♦ Oct 15 '12 at 11:07
