This book is beneficial for those researchers who are working on Network Security specially in Wireless Ad-Hoc Sensor Network. In Wireless Ad-Hoc Sensor Network concern, there are various types of attacks one of them is Vampire Attack. Wireless sensor network is vulnerable to Denial of Service attack (DoS). DoS attack makes resources blocked and not available to users. This Denial of service attack is creating suitable condition for Vampire attack and makes main cause for it. In Vampire attack it makes the node to consume more battery power and degrades the network performance. Vampire attack does not rely on any particular type of routing protocol. There are so many techniques discovered to find such kind of attacks but each has pros and cons. In this technique use the EWMA. In this calculate the energy consumption of the each node in the network. Trust value of each node is calculated for the routing. The node having low energy consumption and high trust value is selected for the routing.