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Before hacking a WiFi AP, we need to gather information about the Network.For Example. If you are security personnel and wanted to secure all the WiFi points in your Company, you need to know the BSSID or ESSID, Channel , range, etc.Senario: If we want to make sure that our WiFi is safe we need to take many safety precautions, like changing the passwords reguarly and setting up a password with combinations of alphanumerics etc.To find that the password we have set for that WiFi is not guessable, we can perform an attack to that WiFi AP by cracking the passwords.
To Crack a WiFi passowords we need some information about the Access Point.
For Eg.
we can get these information using this tool.
inSSIDer is an excellent Wi-Fi analyzer that can be installed on Windows and Mac machines, and there is a version for Android, as well. inSSIDer displays information about the wireless networks in your proximity, including access points' MAC addresses, encryption type, signal strength, and channel. inSSIDer offers several new features since we last reviewed the software, including support for 802.11ac. Wi-Fi professionals may find the software a bit too light on features and might be more interested in a more robust program such as WiFiBuilder or Wireshark, but, for everyone else, inSSIDer is one of the most-powerful and easy-to-use Wi-Fi optimizers around.
Features and Interface
I tested inSSIDer on a Windows 7 laptop, and it was a quick, lightweight install. Unlike some other free networking utilities I've used, inSSIDer has given me no problems with memory leaks, nor has it interfered with Windows wireless settings or any other installed software.
Opening the interface displays the wireless adapter information of the client machine on which inSSIDer is installed. The program's UI is divided between a pane that displays real-time information about wireless networks in proximity and another screen that shows handy information, including tips and a user guide.
The user guide has illustrations and plain-language explanations about the features in the software. You don't just get a user guide, though. The interface also includes links to free webinars for those who want to dive deeper into the wireless world—from diagnosing RF interference to performing basic wireless-packet analysis. There are also links to tools that help users find interference issues and reduce Wi-Fi saturation, as well as advice on selecting the right wireless channel.
Clicking on the Network tab pulls up the real-time information about all nearby wireless networks. By default, the software stars the network to which you are connected. The software helps you optimize that network and prominently displays details about this network, so you can view information such as how many other access points are using the same channel. For performance improvement, you could use this information to place your starred network on a less-crowded channel. This may be one of the most-useful troubleshooting features in the software.
You also get details on all networks in proximity, including signal strength (some tools refer to this as RSSI), channel, security, and MAC address of each access point. A handy graph details a wireless network's signal strength over time.
Right-clicking on any listed network opens a menu that lets you quickly select the information you want to see about that network: SSID, signal, channel, maximum rate, network type, and even the access point's vendor. Your entire view of available networks can also be sorted by the same parameters.
inSSIDer will also calculate a Link score based on information such as channel overlap and signal strength for each wireless network. You can see how tweaking channel settings or even relocating an access point or router influences the score—the higher the score, the better the network performance you should receive.
Install Inssider from https://www.metageek.com/products/inssider/office/ and capture some available AP and analyze the information.
Watch these Videos for more information
What is Wifi Hacking and War Driving -part 1 https://youtu.be/psBj-1cozBk
Ethical Hacking - wifi hacking and war driving part 2 https://youtu.be/Tg-qIXLdGrI