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By Fred Langa If your Wi-Fi router supports Wi-Fi Protected Setup (WPS) — and most newer home/small-business routers do — it might easily reveal its passwords to a readily available hacking tool. You can use that tool to be 100 percent certain your router isn't vulnerable to malicious WPS hacking. Here's how. Recap: Why WPS routers are typically not secure Think your Wi-Fi router's safe because you use a long and complex passphrase? Think again! In the Dec. 13  Top Story , I discussed a fundamental security flaw in most routers using WPS technology. In short, all WPS-enabled routers have a built-in, easily hackable back door: a simple, vendor-assigned PIN (personal identification number) of just six to eight numerals. This PIN can easily be guessed by free hacker tools that run on ordinary laptops — or even smartphones. A hacked WPS PIN opens the door to your entire Wi-Fi network. With the correct PIN, an attacker can recover a router's passphrase, giving...