Title: ERAC-MAC efficient revocable access control for multi-authority cloud storage system

Authors: Sudha Senthilkumar; V. Madhu Viswanatham

Addresses: Vellore of Institute of Technology, Vellore, 632014, India ' Vellore of Institute of Technology, Vellore, 632014, India

Abstract: In the current scenario, there is an appreciable escalation in the utilisation of cloud computing by critical industrial applications due to its cost-effective storage and computing. However, due to an untrusted server in a cloud, the access control turns out to be the challenging issue to ensure the confidentiality of sensitive data. The ciphertext policy attribute-based encryption (CP-ABE) is deliberated to be an apt technique to enforce the access control for encrypted cloud outsourced data. But, due to the computation complexity of decryption, user revocation and complexity of key management for achieving granularity, prevailing CP-ABE schemes when applied directly to multi authority attribute system, incurs more computational costs in the order of NP. In this paper, an efficient CP-ABE based multi authority attribute system is put forth that supports decryption and user revocation by CSP with the advent of a blind encryption/decryption technique and a novel colouring scheme for predicting user behaviour analysis. Security and performance of ERAC-MAC was analysed and found to be much better than the other prevailing schemes. The implementation was done using the paring based cryptography library of the Stanford University in Ubuntu environment.

Keywords: ciphertext policy attribute-based encryption; CP-ABE; attribute revocation; attribute authority; multi attribute authority.

DOI: 10.1504/IJITST.2019.101824

International Journal of Internet Technology and Secured Transactions, 2019 Vol.9 No.3, pp.221 - 241

Received: 31 Oct 2017
Accepted: 04 Feb 2018

Published online: 28 Aug 2019 *

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