High frequency reporting of energy utilization data in smart grid can leads to leaking sensitive information regarding end users life style. We propose A Differential Private Noise Cancellation Model for Load Monitoring and Billing for Smart Meters (DPNCT) to protect the privacy of the smart grid data using noise cancellation protocol with a master smart meter to provide accurate billing and load monitoring. Next, we evaluate the performance of DPNCT under various privacy attacks such as filtering attack, negative noise cancellation attack and collusion attack. The DPNCT model relies on trusted master smart meters and is vulnerable to collusion attack where adversary collude with malicious smart meters in order to get private information of other smart meters. In this paper, we propose an Enhanced DPNCT (E-DPNCT) where we use multiple master smart meters for split noise at each instant in time t for better protection against collusion attack. We did extensive comparison of our E-DPNCT model with state of the art attack resistant privacy preserving models such as EPIC for collision attack and with Barbosa Differentialy Private (BDP) model for filtering attack. We evaluate our E-DPNCT model with real time data which shows significant improvement in privacy attack scenarios without any compute intensive operations.
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