Authentication and Certificate Managements of Unauthorized Intrusion in Ad-Hoc Networks, Problems and Solutions

The development of today´s wireless technology with its sophisticated devices and applications has attracted many users and becoming more important in their daily life. Ad hoc networks have emerged from this technology to provide new services to mobile users. In contrast with conventional wireless networks, ad hoc networks are not connected to any stationary infrastructure. Furthermore, the mobility functions, such as routing, connection´s decisions and security managements, are performed by the nodes themselves independently. Therefore, the security problem for mobile ad hoc networks is becoming one of the major issues that need to be solved. The security of ad hoc networks is based on certification authority (CA) which issues and manages security certificates and public keys for message encryption. This paper introduces a new method of detecting unauthorized intrusion that is used by malicious user who issues a forged certificate to join a group of ad hoc network. This method also eliminates unnecessary certificates exchange among users´ nodes to reduce traffic flow inside the network.