HABEm: Hierarchical Attribute Based Encryption with Multi-Authority for the Mobile Cloud Service
Qian He, Song Jing, Xu Hong, Yong Wang · 2020
For the mobile cloud service, the computation and power resources of the mobile terminal are limited. And the attribute-based encryption algorithm has the uncertainty of the attribute expiration time, which highly likely results in the leakage of user privacy, and causes a huge waste of computation and bandwidth resources. To deal with these problems, a hierarchical attribute-based encryption with multi-authority for the mobile cloud service (HABEm) is proposed in this paper. A hierarchical multi-level authorization mechanism, referring to different levels of authorities, manages different attributes of mobile terminal. A proxy is introduced to delegate the high complexity decryption algorithm to improve the decryption efficiency of the mobile terminal. The mobile terminal performs attribute revocation through the authorization authority when the rank of the mobile terminal is changed. Based on the deterministic assumption of the standard model, HABEm is proved to be CPA-safe in theory. The experiment results show that HABEm has higher decryption performance and is very suitable for the mobile cloud service environment.