Implementation of Multi-Authority Data Access Control System in Public Cloud Storage

Abstract

Data access control is an efficient way to provide the data security in the cloud but due to data outsourcing over untrusted cloud servers, the data access control becomes a challenging issue in cloud storage systems. Attribute-based Encryption (ABE) technique is regarded as a most trustworthy cryptographic conducting tool to guarantee data owner’s direct control on their data in public cloud storage. The previous ABE schemes involve only one authority to maintain the complete attribute set, which can bring a single-point hindrance on both security and performance. In this paper, from another perspective, we conduct a threshold multi-authority CP-ABE access control scheme for public cloud storage, named TMACS, in which multiple authorities jointly manage a uniform attribute set and every authority is able to issue attributes independently.
Keywords: CP-ABE, (t,n) Threshold Secret Sharing, Multi-Authority, Public Cloud Storage, Access Control.