Graduate School and Research Center in Digital Sciences

Reconciling cloud storage functionalities with security : Proofs of storage with data reliability and secure deduplication

Vasilopoulos, Dimitrios

Thesis

In this thesis we study in depth the problem of verifiability in cloud storage systems.  We study Proofs of Storage -a family of cryptographic protocols that enable a cloud storage provider to prove to a user that the integrity of her data has not been compromised- and we identify their limitations with respect to two key characteristics of cloud storage systems, namely, reliable data storage with automatic maintenance and data deduplication.  To cope with the first characteristic, we introduce the notion of Proofs of Data Reliability, a comprehensive verification scheme that aims to resolve the conflict between reliable data storage verification and automatic maintenance. We further propose two Proofs of Data Reliability schemes, namely POROS and PORTOS, that succeed in verifying reliable data storage and, at the same time, enable the cloud storage provider to autonomously perform automatic maintenance operations.  As regards to the second characteristic, we address the conflict between Proofs of Storage and deduplication. More precisely, inspired by previous attempts in solving the problem of deduplicating encrypted data, we propose message-locked PoR, a solution that combines Proofs of Storage with deduplication.  In addition, we propose a novel message-locked key generation protocol which is more resilient against off-line dictionary attacks compared to existing solutions.

Document Bibtex

Title:Reconciling cloud storage functionalities with security : Proofs of storage with data reliability and secure deduplication
Type:Thesis
Language:English
City:
Date:
Department:Digital Security
Eurecom ref:5965
Copyright: © EURECOM. Personal use of this material is permitted. The definitive version of this paper was published in Thesis and is available at :
Bibtex: @phdthesis{EURECOM+5965, year = {2019}, title = {{R}econciling cloud storage functionalities with security : {P}roofs of storage with data reliability and secure deduplication}, author = {{V}asilopoulos, {D}imitrios}, school = {{T}hesis}, month = {07}, url = {http://www.eurecom.fr/publication/5965} }
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