Hack A Wi-Fi Connection
Many windows users are digging up in the internet for hacking Wi-fi networks and they all show up using Blacktrack or other Linux operating system. I'm just sharing the method to Crack Wi-Fi networks using WEP security protocol. It takes up to 5-6 hours to crack a password or even 11-12 hours with having strong password.
Flaw in WEP:
Because RC4 is a stream cipher, the same traffic key must never be used twice. The purpose of an IV, which is transmitted as plain text, is to prevent any repetition, but a 24-bit IV is not long enough to ensure this on a busy network. The way the IV was used also opened WEP to a related key attack. For a 24-bit IV, there is a 50% probability the same IV will repeat after 5000 packets.
Depending on the amount of network traffic, and thus the number of packets available for inspection, a successful key recovery could take as little as one minute. If an insufficient number of packets are being sent, there are ways for an attacker to send packets on the network and thereby stimulate reply packets which can then be inspected to find the key. The attack was soon implemented, and automated tools have since been released. It is possible to perform the attack with a personal computer, off-the-shelf hardware and freely available software such as aircrack-ng to crack anyWEP key in minutes.
Generic weaknesses of WEP:
- The use of WEP was optional, resulting in many installations never even activating it, and
- WEP did not include a key management protocol, relying instead on a single shared key among users.
