Self-certified Public-key Encryption Scheme In Smart Grids

The emergence of the Smart Grid has made our lives richer and smarter,relying on its various grid devices and services provided.However,the wireless nature of grid equipment is prone to user privacy leaks.Once a malicious attacker gains the identity and other important private information of the grid user,it will launch a user simulation attack to obtain free service,and even threaten the user to grab money.Therefore,as the demand for electricity increases,it becomes an urgent need for many researchers to design Anonymous User Authentication(AUA)protocols between the users and servers for multi-server architectures,which can solve network congestion caused by a large number of grid service requests and responses.However,most existing AUA protocols are weak in privacy protection,some of which incur high computation and communication costs once deployed.At the same time,considering that most of the grid equipment is low-energy with wireless characteristics,this paper proposed an efficient and enhanced AUA(Enhanced Anonymous User Authentication,E-AUA)protocol.This protocol adopts a self-certified public key encryption method.By using this method,no third-party participation is required in the authentication process of both parties.Subsequently,both parties only need to use their respective private keys to complete identity authentication and key agreement,in order to achieve user anonymity and resist various attacks such as modification and replay attacks to improve system security.In addition,in the process of identity authentication and key agreement between the two parties,the use of online/offline separate processing mechanism reduces the client-side computational cost of the E-AUA protocol.Compared with the latest AUA protocol,our E-AUA protocol reduces the computational costs on the client and server sides by 13.7893 milliseconds and50.8942 milliseconds respectively,and reduces the total communication overhead by928 bits.In addition,we prove that our E-AUA protocol is semantically secure by using the random oracle model,and prove that our protocol can meet various important security attributes through theoretical analysis.The above results show that our E-AUA protocol is more suitable for deployment in actual Smart Grid scenarios.