Analysis of denial of services attacks in wireless local area networks

Tema ovoga rada je proučavanje sigurnosti bežičnih lokalnih mreža i napada na njih. Postoje mnoge vrste napada koji mogu ugroziti sigurnost korisnika bežične lokalne mreže. Jedna od vrsta napada su i Denial of Service napadi. Ta vrsta napada se služi raznim metodama kako bi prekinuli komunikaciju između korisnika i mreže. U radu je objašnjeno kako ti napadi funkcioniraju. U praktičnom dijelu rada je opisan napad Evil Twin koji pripada u gore navedenu skupinu. U tome se napadu korisnika odspaja s trenutne mreže te ga se prespaja na mrežu napadača. Napad je uspješno izveden u laboratorijskim uvjetima. Moguće ga je ponoviti i u realnim uvjetima uz odgovarajuće opremu bez da korisnik primijeti da je napadnut.The subject of this paper is studying the wireless local networks and attacks on them. There are many types of attacks that can endanger the security of the user using wireless local network. One of them is called Denial of Service attack. That type of attack uses different methods in order to stop communication between the user and the network. In this paper these methods are explained. In practical part of paper, an attack called Evil Twin is described and executed. In that attack, the user is disconnected from his current network and reconnected to the attacker's network. The attack is successfully executed in laboratory conditions. It can be repeated in realistic conditions, with appropriate equipment, without the user noticing