Public Audit and Secure Deduplication in Cloud Storage using BLS signature

Abstract

Although many researches have been done individually on each topic of secure deduplication and
integrity auditing, the study of the combined model of these two functions was relatively few. In this
paper, we propose a scheme to provide client-side deduplication for the encrypted data while simultaneously
supporting public audit of data stored in the cloud. The proposed scheme performs the
challenge-response protocol for secure deduplication and integrity audit using BLS signature based
homomorphic linear authenticator, and supports public audit using the third party auditor. The proposed
scheme satisfies all the basic security objectives and improves the problems of the existing
schemes.