Related work and motivations Two categories of security solutions u Secure routing protocols a Key management mechanisms Most of the two categories of solutions require u a trusted authority to issue certificates aA centralized server to monitor the networks A secret association between certain nodes Cryptographic authentication at each routing packet Disadvantages a Destroy the self-organization nature of manet Introduce huge performance overhead Single point of failure Less of efficiency and availability 9 May 29, 2009 CSE CUHK9 May 29, 2009 CSE CUHK Related Work and Motivations ◆ Two categories of security solutions ◼ Secure routing protocols ◼ Key management mechanisms ◆ Most of the two categories of solutions require: ◼ A trusted authority to issue certificates ◼ A centralized server to monitor the networks ◼ A secret association between certain nodes ◼ Cryptographic authentication at each routing packet ◆ Disadvantages ◼ Destroy the self-organization nature of MANET ◼ Introduce huge performance overhead ◼ Single point of failure ◼ Less of efficiency and availability