Traditional electrical systems are one way in nature in which electricity is generated at a few central power plants and delivered to consumers through transmission and distribution grids. Digital transformation changed the traditional electrical grid into the smart grid which is considered as a next-generation power grid. VANETs which is a part of the Intelligent Transportation System (ITS) offer traveler safety, reduced traffic congestion, provide vehicle information, and contribute to protecting natural resources. It offers Vehicle to Vehicle (V2V), Vehicle to Infrastructure (V2I), and Vehicle to Grid (V2G) communication facilities for the smooth operation of VANET. Security is of utmost importance in advanced communication networks such as smart grid and Vehicular Adhoc Networks (VANETs). The book focuses initially on analyzing and solving knapsack problem as a cryptanalysis problem.