Hierarchical Attribute-Based Encryption Scheme Supporting Computing Outsourcing and Time-Limited Access in Edge Computing

With the rapid increase of user data and traffic, the traditional attribute encryption scheme based on the central cloud will cause the bottleneck of computing performance. And user's access privilege and ciphertext in the existing scheme is not limited by the time duration and the number of attempts, which could be brute force attack. We propose a solution to support computing outsourcing and time-limited access in edge computing. Edge nodes can shorten data transmission distances and eliminate latency issues. To solve the central cloud performance problem during encryption and decryption, massive and complex computing is considered outsource to edge nodes. And set valid time for the ciphertext and the user key, which avoid their permanent validity and significantly improve data security. In addition, all attributes are divided into attribute trees. According to the hierarchical relationship between attributes, we judge the user's access privilege. Finally, we give security proof, performance cost, functional comparison of the scheme.