Obscurity is still security. But it is a speed bump, not a locked door. Security is probabilistic in nature and it is quite confusing that people portray it as a static concept. For example, remote wiping your phone when lost is a common practice. You ACT as if the information has been extracted but you still wipe. Why? Because not doing so gives a potential adversary infinite time to retreive the data. Similarly speed bumps make it harder. Every security researcher will tell you that there are no foolproof methods. If there were we wouldn't have this cat and mouse game with hackers. It is all probabilistic and anything you do to increase your odds against hackers is, by definition, security.