Smart grid has recently emerged as the next generation of power grid use to its eminent featured, like that distributed energy control, robust to load fluctuations, and close user-grid interactions. It essential component of smart graph, demand response can maintain supply-demand balance and reduce client' electricity bills. Furthermore, it is also critical to preserve user privacy and cyber security in smart grid. In the proposed system an efficient QMS Protocol & CAD Algorithm. To efficiently identify the intruders.