Design And Analysis Of A Multi-Authority Attribute-Based Encryption Scheme For Mobile Devices In An Edge Computing Environment

In the rapid development of cloud computing,it has won the favor of a large number of enterprises and independent users with its strong storage and computing capabilities and relatively low cost.At the same time,due to the fast update speed of mobile devices and the influx of a large number of lightweight terminals into the Io T,many security and efficiency issues have become increasingly prominent.Some of the remaining problems are as follows:(1)Mobile devices have some natural limitations as terminals,such as: storage resources and computing resources are quite limited.(2)The public cloud server is semi-trusted entity,and it is difficult to avoid malicious users from stealing data stored in the cloud.(3)The ABE scheme of a single authority requires more workload and faces the security problem of excessive authority in a large-scale cloud environment.In response to the above problems,the main work and contributions of this article as follows:(1)First,we propose an original hybrid cloud multi-authority ciphertext-policy attributebased encryption(HCMACP-ABE)scheme.Compared with the existing scheme,this scheme solves the key escrow and efficiency bottlenecks by using multi-authority without CA.And we utilize the LSSS(Linear Secret-Sharing Schemes)access structure to realize secure access control.At the same time,we combine the scheme with the hybrid cloud system.In this system,the private cloud is responsible for maintaining the user’s authorization list,confirming that the key uploaded by the user,and implementing preprocessing.Finally,we prove that our proposal achieves IND-CCA secure and is efficient in a mobile hybrid cloud computing environment.(2)On the basis of the original scheme,we improved and proposed a multi-authority attribute-based encryption scheme based on elliptic curve in the edge environment.We introduce the edge computing model and use the feature of sinking computing resources to nodes to transform the interaction between mobile devices and the cloud in the Io T into the interaction between mobile devices and edge nodes.Besides,considering that the mobile device in the actual environment is often not a single attribute device,we segmented and weighted the device attributes,and realized the attribute segmentation based on the encryption scheme under the elliptic curve.Finally,we proved that the scheme also achieves IND-CCA secure.