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Decentralized node admission is an essential and fundamental security service in Mobile Ad hoc NETworks (MANETs). It is needed to securely cope with dynamic membership and topology as well as to bootstrap other important security primitives (such as key management) and services (such as secure routing) without the assistance of any centralized trusted authority. An ideal admission technique must involve minimal interaction among MANET nodes, since connectivity can be unstable. Also, since MANETs are often composed of weak or resource limited devices, admission must be efficient in terms of computation and communication.
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