A robust and verifiable threshold multi-authority access control system in public cloud storage

摘要

Attribute base Encryption is the cryptographic conducting tool to assurance data owners enduring control above their data in public cloud storage. The proposed ABE plans include one and only power (Authority) to keep up the entire trait (Key) set, which can carry a solitary (single) point bottleneck on both safety and execution. In this way, some multi-power (Multi-Authority) plans are proposed, in which various powers independently keep up disjoint trait subsets. In any case, the single-point bottleneck issue stays unsolved. In this paper, from another point of view, we lead an edge multi-power CP-ABE access control plan for open distributed storage, named TMACS, in which various powers together deal with a uniform characteristic set. In [9] TMACS, exploiting (t; n) limit mystery sharing, the expert (Master) key can be shared among numerous powers, and a legitimate client can produce his/her mystery (Private) key by cooperating with any t powers. Security and execution investigation results demonstrate that system is not just undeniable secure when not as much as t powers are traded off, additionally dynamic when no not as a great deal as t powers are alive in the framework. Besides, by proficiently joining the customary multi-power plan with system, we build a half and half one, which fulfils the situation of traits originating from various powers and accomplishing security and framework level strength.