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In Mobile ad hoc networks (MANETs) mobile computer§devices create§a network by using wireless communication. In§contrast to normal§networks with a fixed infrastructure, the§participants of MANETs§have to work cooperatively because packets for other§nodes have §to be forwarded so that also distant nodes can§communicate with §each other.§§In particular internal attacks by network§participants have to be§considered because the physically access to the§mobile devices is§easy. Therefore it is important to introduce an§Intrusion Detection§System (IDS) that is specialized to the requirements§of MANETs.§One special aspect of such systems is that they have§to be§implemented on every node but have to work§cooperatively with§others. This mechanism is used and enhanced in this work.§§The main aspect is the distribution of reputations§about other§nodes. Every node is running an own local IDS that§provides data§for the reputation calculation that is exchanged§subsequently.§Therefore a node gets reputations about all other§participants of§the network from its neighbors. The concept of this§work describes§with processes and algorithms a way to exchange§reputations§between network participants.