Enabling Secure Deduplication in Encrypted Decentralized Storage

Bo Zhang, Helei Cui, Yaxing Chen, Xiaoning Liu, Zhiwen Yu, Bin Guo

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Scopus citations

Abstract

With the rapid development of blockchain technology, decentralized cloud storage services are emerging and have been a storage new option in this era. They aim to leverage the unused storage resources across the network to build a more economical and reliable distributed storage network and thus eliminate the trust in the centralized storage providers via matured blockchain consensus mechanisms. However, current solutions either lack the protection of user data privacy or apply conventional encryption methods that cannot support cross-user deduplication over encrypted data. These limitations make them struggle to balance the need for optimized storage space utilization and encrypted data protection, especially in the scenario where the user’s files are geographically distributed in different nodes around the world. In this paper, we propose a secure deduplication system in the context of encrypted decentralized cloud storage. It utilizes smart contract to incorporate the message-locked encryption (MLE) scheme, the most prominent cryptographic primitive in secure data deduplication. With a carefully tailored design, our proposed scheme can be seamlessly deployed to the public blockchain with transparency. Together, our design enables secure data deduplication over decentralized storage, while providing stringent cryptographic data privacy guarantees. In particular, our proposed design has a natural benefit to prevent potential malicious attacks such as file ownership cheating and file ciphertext poisoning. We implement a prototype of our system and deploy it to Ethereum. Comprehensive performance evaluations are conducted with real datasets to demonstrate the effectiveness and efficiency of our design.

Original languageEnglish
Title of host publicationNetwork and System Security - 16th International Conference, NSS 2022, Proceedings
EditorsXingliang Yuan, Guangdong Bai, Cristina Alcaraz, Suryadipta Majumdar
PublisherSpringer Science and Business Media Deutschland GmbH
Pages459-475
Number of pages17
ISBN (Print)9783031230196
DOIs
StatePublished - 2022
Event16th International Conference on Network and System Security, NSS 2022 - Denarau Island, Fiji
Duration: 9 Dec 202212 Dec 2022

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume13787 LNCS
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349

Conference

Conference16th International Conference on Network and System Security, NSS 2022
Country/TerritoryFiji
CityDenarau Island
Period9/12/2212/12/22

Keywords

  • Decentralized storage
  • Secure deduplication
  • Smart contract

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