Last week I’ve read small news on c’t magazine saying that the default password of EasyBox router used for Vodafone, Telecom, Arcor in Germany … was hacked by Sebastian Petters. That means if someone is using default settings of EasyBox, you can get his WLAN password easily and then access his network. This default password was generated by a algorithm and this algorithm was patented. Therefore like other patents, the complete description of algorithm was simply exposed on internet (http://www.patent-de.com/20081120/DE102007047320A1.html if you can read German). As you can see the algorithm is pretty simple, it just takes the MAC address of router, makes some computations with base changing, xor,plus… Therefore all we have to do is get the MAC address of victim, make a copy of the algorithm ourselves and then generate the default WLAN password.