A Mobile Ad-hoc NETwork (MANET) is a collection of mobile nodes that is connected through a wireless medium forming rapidly changing topologies. It allowing people and devices to seamlessly communicate without any pre-existing communication architecture. Each node in the network also acts as a router. Privacy preserving routing mechanism is very important for MANET. Mobile Ad-hoc NETworks (MANETs) are particularly useful and well-suited for critical scenarios, including military, law enforcement. Security protection, unobservability otherwise the data may hacked by attackers. Number of schemes have been proposed even they don't have efficient routing mechanism for protecting the MANET.