FASTSync: A FAST Delta Sync Scheme for Encrypted Cloud Storage in High-bandwidth Network Environments
FASTSync: A FAST Delta Sync Scheme for Encrypted Cloud Storage in High-bandwidth Network Environments
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DOI：
10.1145/3607536
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发表时间：
2023-07
影响因子：
1.7
通讯作者：
Suzhen Wu;Zhanhong Tu;Yuxuan Zhou;Zuocheng Wang;Zhirong Shen;Wei Chen;Wen Wang;Weichun Wang
中科院分区：
文献类型：
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作者：
Suzhen Wu;Zhanhong Tu;Yuxuan Zhou;Zuocheng Wang;Zhirong Shen;Wei Chen;Wen Wang;Weichun Wang
越来越多的数据存储在云存储中，这带来了两大挑战。首先，云中修改的文件应该快速同步，以确保数据一致性，例如，增量同步（sync）通过仅同步文件的更新部分来实现高效的云同步。其次，云中的大量数据需要进行重复数据删除和加密，例如，消息锁定加密（MLE）通过加密不同用户之间的内容来实现重复数据删除。然而，当组合时，内容中的一些更新可能导致基于MLE的云存储中的密钥和密文的大同步流量放大，从而显著降低云同步效率。提出了一种基于特征的加密同步方案FeatureSync来解决增量放大问题。然而，随着网络带宽的进一步提高，网络同步的性能停滞不前。在我们初步的实验评估中，我们发现，在高带宽的网络环境中的计算开销的瓶颈是主要的瓶颈，在QuestureSync。在这篇文章中，我们提出了一个增强的基于特征的加密同步方案FASTSync，以优化性能的高带宽网络环境中的同步。对FASTSync的轻量级原型实现的性能评估表明，FASTSync平均将云同步时间减少了70.3%，将加密时间减少了37.3%。
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.