Every network hardware device has a MAC address to communicate with each other. When broadcasting, the AP gives out its MAC address. Included in this information is the name of the network (ESSID), if encryption is used (and if so, what type), what data rates are supported (in MBit/s), and what channel the network is on. These beacon frames give fundamental information about the network. Every AP sends out 10 “beacon frames” per second. Managed wireless networks with Access Points (AP) all have a certain set of information that is constantly broadcasted to everyone in range. This protocol lays out specifics for how wireless networks are broadcasted and how security features are implemented in wireless networks, as well as a plethora of other media access control and physical layer specifications. WiFi is run under the IEEE 802.11 protocol. It is also worth noting that on Windows-based machines, packet injection is impossible with Aircrack-ng and is a fundamental limitation. This did not completely limit my options and testing, as some sniffing and cracking features of Aircrack-ng work without having packet injection working. ĭuring the process of setting up Aircrack-ng, I found that my wireless card is not able to perform packet injection. Packet injection allows for the attacker to interfere with an established network connection, by constructing packets to appear as if they are a normal part of the communication stream. A lot of advanced wireless password cracking techniques use a technique called “packet injection”, also known as “packet spoofing”. With wireless cracking, there can be a big hardware limitation in some circumstances. Cracking WiFi Passwords with Aircrack-ng.
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