Research On Data Access Control Based On Blockchai

Personal data privacy security has always been a hot research topic in recent years.However,most of the existing data access models are based on third-party centralized institutions.Although data privacy protection and fine-grained access problems can be solved to a certain extent,it will also cause data problems.Leakage and economic costs increase,and it is impossible to ensure that users control personal data.Furthermore,traditional systems have problems such as singleness and low efficiency,which makes it difficult to withstand the incremental explosion of big data.Based on the above problems,this article combines the current research background and development history,analyzes the shortcomings of the current access control model,and proposes a blockchain-based data access control model BDACS(Blockchain-based data access control scheme),which combines emerging technologies Attribute encryption,blockchain,smart contracts,and distributed storage IPFS solve the problems of data security and fine-grained access,protect the privacy of data transactions between users,and enable individual users to have absolute control over data.And through the improved attribute encryption scheme ICP-ABE(Improved ciphertext policy attribute based encryption),to ensure the efficiency of the attribute in the decryption.The specific research work of this paper is as follows:(1)Improve the attribute encryption algorithm,reduce the number of parameters used in the process of attribute encryption and decryption,reduce the linear correlation between the number of attributes and the operation time,convert the access structure into an access matrix,and adjust the decryption process The calculation formula reduces the complexity of calculation and improves the efficiency of algorithm encryption and decryption.Finally,the efficiency of the original attribute encryption algorithm and the improved attribute encryption algorithm is compared through experiments to verify the efficient performance of the improved attribute encryption algorithm.(2)For the research of attribute encryption,an effective algorithm,a fine-grained data access framework is constructed to protect user privacy and restrict user access rights through attribute encryption.Access control is performed on the user’s access to the data subject’s data,which improves the security of the system and prevents the loss of system data.Combining blockchain technology to remove centralized institutions to prevent the issue of untrustworthiness of a single institution.Design and implement simulation experiments,verify the function and performance of the framework,and prove that the framework proposed in the thesis is feasible and effective.