WiFi Security Testing with the Aircrack-ng Suite
Wireless networks are often the weakest point of entry. Learn how the Aircrack-ng suite is used to audit WiFi security and crack passwords.
To hack WiFi, you need a network card that supports Monitor Mode and Packet Injection. Without these hardware capabilities, you cannot "listen" to traffic you aren't part of.
The Aircrack-ng Workflow
Aircrack-ng isn't one tool, but a suite. The process usually begins with airmon-ng to enable monitor mode, then airodump-ng to scan the airwaves for target Access Points (APs) and connected clients.
Once a target is identified, the attacker captures the "4-way handshake"—the encrypted greeting that occurs when a device connects to a router.
Deauthentication and Handshakes
Waiting for a user to connect naturally can take hours. Ethical hackers use aireplay-ng to send "Deauth" packets, which forcibly disconnect a device from the WiFi. When the device automatically reconnects, the attacker captures the handshake instantly.
The Crack: Once the handshake is captured, aircrack-ng is used to run a dictionary attack against the hash to reveal the plain-text password.
WiFi Cloning and Evil Twins
An "Evil Twin" attack involves creating a fake WiFi network with the same name (SSID) as a legitimate one. Users connect to the clone, and the attacker presents a fake login page to steal their credentials.
Wireless Audit Checklist
- Network card supports Monitor Mode.
- Scan area using airodump-ng.
- Identify target BSSID and Channel.
- Perform Deauth attack to force reconnection.
- Capture WPA/WPA2 Handshake.
- Run Wordlist attack via aircrack-ng.
The Bottom Line
WiFi security is only as strong as the password. Complex passwords and WPA3 encryption are the best defenses against the Aircrack suite.
