A mobile ad hoc network (MANET) is a continuously self-configuring, infrastructure-less network of mobile devices connected without wires. Ad hoc is Latin and means “for this purpose”. Each device in a MANET is free to move independently in any direction, and will therefore change its links to other devices frequently. Each must forward traffic unrelated to its own use, and therefore be a router. The primary challenge in building a MANET is equipping each device to continuously maintain the information required to properly route traffic. Such networks may operate by themselves or may be connected to the larger Internet. They may contain one or multiple and different transceivers between nodes. This results in a highly dynamic, autonomous topology. In Mobile Adhoc Network, Anonymous communication is very important application which is used in adversial environment. A major requirement on the network is the ability to provide unidentifiability and unlink ability for mobile nodes and their traffic. The existing protocols are vulnerable to the attacks of fake routing packets or denial-of-service broadcasting, even the node identities are protected by pseudonyms. In this project the system uses authenticated anonymous secure routing (AASR), to satisfy the requirement and defend against the attacks.