A Lightweight Secure Data Sharing Scheme For Distributed Cloud Environment

摘要

Cloud computing offers enormous benefits to its adopters, but it also comes with its set of problems and inefficiencies of which security is the biggest concern. In order to leverage a remote cloud based infrastructure, a company essentially gives away private data and information that might be sensitive and confidential. Secret sharing schemes are used to restrict access to such sensitive and confidential data. Threshold secret sharing schemes is a scheme in which the number of the participants in the reconstruction phase is important for recovering the secret. In this paper, aiming at tackling the important issue of identity revocation, we are introducing the outsourcing computation into IBE and suggest a revocable IBE scheme should be added in the server-aided setting. Our proposed scheme delivers most of the key generation related operations i.e. key-issuing and Key update processes are performed by Key Update Cloud Service Provider, leaving only a fixed number of simple operations for PKG and users to perform locally. By utilizing a novel collusion-resistant technique, this goal is achieved: we make use of a hybrid private key for each user, in which an AND gate is drawn in to attach and bound the identity component and the time component. In addition, we propose another technique which is verifiable secure under the recently formulized Refereed Delegation of Computation model. To end with, we provide extensive experimental results to reveal the effectiveness of our proposed construction.