Security problems of RFID authentication protocols

The RFID market in Europe is growing. It is expected that in 2007 the market exceeds 2.5 billions USD. Unfortunately, despite of benefits of the technology some problems remaining. One of them is security. Many different attacks have been described in theory and tested practically, but it is difficult to find the perfect secure solution for a wireless unit that has limited computing abilities because of cost constraints. On the way to find the suitable solution, this paper describes different attack types and analyses the ability of two proposed authentication protocols to resist these attacks.