The best way to do this is to use a wireless network adapter that’s capable of packet injection. To crack a WEP network, you’ll need to be able to stimulate enough network traffic to cryptographically attack the key. That being said, if the packets are encrypted via OpenVPN or IKEv2 protocols that most VPNs use, you would not be able to read the data that you have captured. You can crack a WPA or WPA2 protected networks by packet sniffing. The IV count is the important number to watch for since you will need to capture around 50,000 to 200,000 IVs in order to crack a 64 bit WEP key and for a 128 bit key, you will need around 200,000 to 700,000 IVs! Can WPA be cracked? WPA2), the IEEE declared that both WEP-40 and WEP-104 have been deprecated. In 2004, with the ratification of the full 802.11i standard (i.e. In 2003, the Wi-Fi Alliance announced that WEP had been superseded by Wi-Fi Protected Access (WPA). This method is going to be better when we have more than two packets, and our chances of breaking the key will be higher. Once we have done that, we will use a tool called aircrack-ng. In order to crack WEP, we need first to capture the large number of packets that means we can capture a large number of IVs.
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