research-article

FASTSync: A FAST Delta Sync Scheme for Encrypted Cloud Storage in High-bandwidth Network Environments

Authors:

Bo MaoAuthors Info & Claims

ACM Transactions on Storage, Volume 19, Issue 4

Article No.: 37, Pages 1 - 22

https://doi.org/10.1145/3607536

Published: 03 October 2023 Publication History

Abstract

More and more data are stored in cloud storage, which brings two major challenges. First, the modified files in the cloud should be quickly synchronized to ensure data consistency, e.g., delta synchronization (sync) achieves efficient cloud sync by synchronizing only the updated part of the file. Second, the huge data in the cloud needs to be deduplicated and encrypted, e.g., Message-Locked Encryption (MLE) implements data deduplication by encrypting the content among different users. However, when combined, a few updates in the content can cause large sync traffic amplification for both keys and ciphertext in the MLE-based cloud storage, significantly degrading the cloud sync efficiency. A feature-based encryption sync scheme, FeatureSync, is proposed to address the delta amplification problem. However, with further improvement of the network bandwidth, the performance of FeatureSync stagnates. In our preliminary experimental evaluations, we find that the bottleneck of the computational overhead in the high-bandwidth network environments is the main bottleneck in FeatureSync. In this article, we propose an enhanced feature-based encryption sync scheme FASTSync to optimize the performance of FeatureSync in high-bandwidth network environments. The performance evaluations on a lightweight prototype implementation of FASTSync show that FASTSync reduces the cloud sync time by 70.3% and the encryption time by 37.3%, on average, compared with FeatureSync.

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Index Terms

FASTSync: A FAST Delta Sync Scheme for Encrypted Cloud Storage in High-bandwidth Network Environments
1. Information systems
  1. Data management systems
    1. Information integration
      1. Deduplication
  2. Information storage systems
    1. Storage architectures
      1. Cloud based storage

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Published In

cover image ACM Transactions on Storage

ACM Transactions on Storage Volume 19, Issue 4

November 2023

238 pages

ISSN:1553-3077

EISSN:1553-3093

DOI:10.1145/3626486

Editor:
Erez Zadok
Stony Brook University, USA

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Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than the author(s) must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected].

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Association for Computing Machinery

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Publication History

Published: 03 October 2023

Online AM: 07 July 2023

Accepted: 20 June 2023

Revised: 22 March 2023

Received: 27 September 2022

Published in TOS Volume 19, Issue 4

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National Natural Science Foundation of China
Open Project Program of Wuhan National Laboratory for Optoelectronics
Research Project of Zhejiang Lab

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