Security Issues and Link Expiration in Secure Routing Protocols in Manet: a Review

Link Expiration is a major problem in existing secure as well as non-secure routing protocols of mobile ad hoc network (MANET) and is one of the most encouraging research areas. Due to link expiration packet loss and other routing overhead increased. So, the requirement is both: secure and reliable link. Secure communication in mobile ad hoc networks is difficult due to the following factors: mobility, limited resource availability, dynamic topology and limited processing power. MANETs are highly vulnerable to attacks namely, passive attacks and active attacks. Traditional routing protocols do not provide security. So, various secure routing protocols have been proposed to secure mobile ad hoc network. Link disconnection is another problem in mobile ad hoc network. Due to mobility of nodes link expires and the node has to find another route for sending the data. So, that route must be found in which the link does not expire before all the packets reach the destination. In this paper, the focus is on the security attacks present in the existing secure routing protocols and on those protocols which focus on link expiration time between nodes for sending the packets or data.