Research On Access Control Based On Attribute Encryptiuon In Smart Grid

As the next generation grid,the smart grid is a network with two-way electricity and information flow that combines communication,sensing,control,computing and automation.Its establishment relies on intelligent sensing devices distributed in different areas,such as smart meters installed in users' homes,intelligent electronic devices located in substations,and power transmissions monitoring equipment displayed in outdoor.In addition,users in different roles in the smart grid system have different access requirements for devices in the grid.For example,ordinary users need to access smart meters in the home to manage the household electrical equipment,and the power company employees need to access the smart sensors to operation,and equipment maintenance personnel need to access equipment to repair equipment failures,and so on.What's more,the smart grid has higher reliability and security requirements than general network that only transmits information.Also,in complex natural and communication environments,fine-grained control of access to different types of devices is especially important.This thesis focuses on the smart grid's multi-user roles,multiple types of equipment and complex environments,designing a comprehensive solution for authentication,authorization and access control.Firstly,this paper introduces the concept of time attribute and builds a time-limited attribute cryptography scheme.Then,this scheme and multi-factor authentication technology are combined to design a reliable integrated scheme of integrated user authentication,authorization and access control.The advantages of this solution are as follows:(1)Efficient user rights management.Through the use of time attributes,the authorization ticket issued by the control center for the user is time-sensitive,so the user will no longer be able to access the device after the expiration.(2)Offline access control.When the control center is offline,the device can perform access control normally.Secondly,based on the first scheme,the identity attribute of the entity in the system is hierarchically managed,and the upper manager can delegate the key for the lower level according to the hierarchical structure of the smart grid.This paper also designs a hierarchical authentication,authorization,and access control solution.In addition to the advantages of the first solution,this solution also solves the bottleneck problem of the control center,which it uses the key delegation to hand over the key of the device to the lower-level manager,so it can greatly reduce the computational strength of the control center and prevent the control center from becoming the system bottleneck.In the end,this thesis not only proves the security of the two schemes,but also proves that the scheme has certain application value to the smart grid system through performance analysis.