Research On Smart Home Access Control Scheme Based On Blockchain

In modern society,smart home has become a part of people’s daily life.In order to create a good smart home interconnection system and provide more valuable services for users,it is usually necessary to share the smart home data with the outside world.However,these shared data often contain a large number of user sensitive privacy data.At present,there is still a lack of an effective smart home data access control scheme to ensure the security of user data,which will become the bottleneck of the development of smart home.At present,more than 90% of the smart home network access is through the mobile intelligent terminal.These terminal devices have the characteristics of scattered network topology and limited resources,which are vulnerable to external attacks and key disclosure.In addition,the traditional smart home access control system is centralized management,which does not include all participants in the access control decision-making process,and the data owner lacks the right to speak in the process of access policy making and decision-making.This enables the data requester to access the smart home device data without the authorization of the data provider,and there is a risk of unauthorized access.As an emerging technology,blockchain has the characteristics of decentralization,unforgeability and traceability.It is a potential technology to solve the privacy security of smart home.Therefore,this paper studies the security access control of smart home data by combining blockchain technology and password technology,and realizes the safe and efficient access control of smart home data.The main contents of this paper are as follows:(1)In view of the security risks of smart home devices in the process of key use and storage,this paper proposes a threshold group signature scheme suitable for smart home scenarios by combining with domestic SM2 cipher algorithm.In the scheme,the key is distributed generated and stored,and the verification formula is used to verify the distributed key and signature in the process of key generation and signature,which ensures the security of digital signature of smart home devices.The security analysis shows that the signature scheme has the characteristics of anti collusion attack,anonymity and traceability.The simulation results show that the proposed scheme has good performance and performance.(2)In view of the problem that the access control of smart home is generally managed by the third-party authorized organization,and there is the problem of unauthorized access,a BSH(blockchain based smart home)access control scheme based on blockchain is proposed.The scheme extends the access control model based on attribute(ABAC),and applies blockchain technology to the ABAC model of smart home to realize fine-grained access control.In the scheme,the resource provider first publishes the resource access control policy to the blockchain.If the resource visitor wants to access the resource,it needs to submit an access request to the blockchain,and uses SM2 threshold signature to process the transaction proposal.The endorsement peer node in the blockchain runs the access control policy smart contract to decide whether to grant the access right.This scheme can ensure that resource providers can participate in all the process of access control,and avoid the risk of unauthorized access caused by the centralized management of the third party.Finally,the proposed scheme is simulated on hyperledger fabric alliance chain development platform,and the results show that BSH access control scheme has good applicability in smart home scenarios.