| With the increasing demand of data users for services,edge computing has emerged as the times require.User privacy and security of sensitive data have become the top priority.However,traditional attribute encryption requires terminal nodes with insufficient computing power to bear most of the computational overhead,and outsourcing under edge nodes needs to be introduced.This article integrates multi authorization,policy update,attribute revocation,and user revocation functions in real application scenarios into outsourcing methods.Therefore,focusing on the application of attribute encryption technology in edge environments,this article will mainly divide the research work into the following points.(1)This article proposes a multi authorization attribute encryption method applied in edge environments.In this method,the access matrix is constructed by linear secret sharing,the edge platform is used as the intermediate node,and the bilinear computation in attribute encryption is replaced by simple scalar multiplication under elliptic curve cryptography.Reduce key escrow and local runawa issues through multiple attribute authorization centers.In the experimental part,the number of attributes is used as a variable to reduce computational overhead through linear matrices and elliptic ciphers.The security analysis proves that the scheme is feasible and secure.(2)To solve the problem of revocation and update of users and attributes in applications,this paper proposes an attribute encryption method that can be revoked and policy updated in edge computing.On the basis of multiple authorizations and decryption outsourcing,this method achieves policy update function by giving a unique user identifier and generating an update key.It also achieves access control update requirements for different users or attributes by generating public and private keys through different attribute authorization agencies,making it impossible for updated revoked users to successfully access data.The attribute set does not need to meet the function of decrypting data without satisfying the revoked attribute,The access control of attribute encryption is dynamic.The experiment takes the number of attributes as a variable and introduces a conversion key based on the previous scheme in terms of policy update and attribute revocation,in order to reduce the cost of attribute policy update.To sum up,this paper implements a multi authorization decryption outsourcing attribute encryption access control method with the functions of user revocation,attribute revocation,and policy update in the edge computing environment,which reduces the communication burden of end users,increases the security and dynamics in the data transmission process,and realizes the fine-grained access requirements of attribute encryption methods.. |
