There are some Wi-Fi hacking techniques and the tools — nearly all free — you can use for penetration testing. These tools will help you uncover rogue access points, weak Wi-Fi passwords, and spot other weaknesses and security holes before someone else does.
You can use Wi-Fi stumblers to detect nearby access points and their details, like the signal level, security type and media access control address. You might find access points set with weak Wired Equivalent Privacy security, which can be easily cracked, or possibly rogue access points setup by employees or others that could be opening your network up to attack. If there are access points set with a hidden or non-broadcasted SSID (network name), Wi-Fi stumblers can quickly reveal it.
You can use wireless sniffers to capture raw network packets sent over the air. You could import the captured traffic into other tools, such as to crack encryption. Or if you're connected to the network (or if it's not encrypted), you could manually look for email and website passwords sent in clear-text.
Here are a few Wi-Fi stumblers and sniffers:
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