Requirement: A PC installed with Linux Backtrack 5 RC2 Working Wireless LAN Card Installed (Important Part) Huge Updated Dictionary File with password (Google It) Goto any wifi hotspot, and crack it..;) Let's start Step 1: Run this command to check available Wlan adapters. Code: airmon-ng It should give you output something like below. Now we know that we have only one wireless interface wlan0 lets proceed to new step Step 2: Now lets try to start the airmon service on the interface that we have just found in Step 1. Run the give command Code: airmon-ng start wlan0