Research On Privacy-preserving Data Aggregation In Smart Grid

The smart grid has attracted great attention as a new energy network.In the smart grid,the power supplier collects the total power consumption of all users in the region through the smart meter within a period of time,and analyzes the relationship between the current power supply and demand to formulate the power supply strategy,so as to maintain the balance between the power production and demand,and avoid the situation that the power supply is insufficient or too large to effectively store and cause waste.However the fine-grained measurements of household energy consumption by smart meters raise serious privacy issues.Therefore,it is necessary to study the aggregation technology to protect data privacy in the smart grid environment,and it has important theoretical significance and research value.This thesis studies the data aggregation technology in the smart grid environment,and the main work is as follows:With analyzing the lightweight smart grid data aggregation scheme proposed by Gope et al.,we point out the secure problems in their schemes and propose a secure and efficient data aggregation scheme in smart grid environment to solve these problems.The proposed scheme uses the idea of flag bit to distinguish the smart meter with normal uploaded data from the smart meter without timely uploaded data due to various reasons,thus ensuring the correctness of the final aggregation results and overcoming the shortcomings of Gope et al.' scheme.In addition,the proposed scheme also reduces the number of communicational interaction between entities during the authentication process,so that the efficiency of data aggregation and the response time are improved.Security analysis and proof show that the proposed scheme is secure.In order to make the power suppliers can be more effective and reasonable use of the collected user data,a multidimensional data aggregation scheme is proposed in the smart grid environment.The proposed scheme not only protects data privacy,but also achieves multidimensional data aggregation,so as to meet the actual needs of smartgrid.Compared with the existing schemes,the proposed scheme can effectively reduce the computational and communicational costs and improve the efficiency of data aggregation.Based on the proposed secure and efficient data aggregation scheme in smart grid environment,a simulation system is designed and implemented using JAVA language and JPBC cryptography library,which verifies the correctness and feasibility of the proposed scheme.