We will decrypt packets from the WEP capture file we created earlier: WEPCrackingDemo-01.cap. For this, we will use another tool in the Aircrack-ng suite called airdecap-ng. We will run the following command, as shown in the following screenshot, using the WEP key we cracked previously:

airdecap-ng -w abcdefabcdefabcdefabcdef12 WEPCrackingDemo-02.cap

The decrypted files are stored in a file named WEPCrackingDemo-02-dec.cap. We use the tshark utility to view the first ten packets in the file. Please note that you may see something different based on what you captured:

WPA/WPA2 PSK will work in exactly the same way as with WEP, using the airdecap-ng utility, as shown in the following screenshot, with the following command:

airdecap-ng –p abdefg WPACrackingDemo-02.cap –e "Wireless Lab"