Issues with trust management and trust based secure routing in MANET

MANET is a spontaneously deployed network of mobile devices working on the assumption of nodes cooperation in absence of a centralized controlling authority. The assumption of nodes cooperation is true only if nodes are trustworthy. However, sometime nodes behave maliciously and selfishly by not cooperating in routing and forwarding processes. The purpose of malicious node is to assault network while the motivation behind selfish node is to save its assets by not cooperating with other, so appropriate security measures must be provided for handling the asserted types of nodes. Trust management is one of the schemes that can be utilized for dealing with the affirmed nodes in MANET. However, trust management in MANET is a challenging task because of its unique characteristics. This paper investigates general issues related to each step of trust management in MANET and explores trust management schemes developed for routing security in MANET.