This week's book giveaway is in the General Computing forum. We're giving away four copies of Arduino in Action and have Martin Evans, Joshua Noble, and Jordan Hochenbaum on-line! See this thread for details.
You must have stumbled upon numerous SSO implementations during your quest to find an answer since 2/28; which ones of those are you considering? And what, exactly, do you mean by "more secured"? What attack scenario are you trying to guard against in particular?