Avocado: A Secure In-Memory Distributed Storage System

Authors: 

Maurice Bailleu, Dimitra Giantsidi, and Vasilis Gavrielatos, University of Edinburgh; Do Le Quoc, Huawei Research; Vijay Nagarajan, University of Edinburgh; Pramod Bhatotia, University of Edinburgh and TU Munich

Abstract: 

We introduce Avocado, a secure in-memory distributed storage system that provides strong security, fault-tolerance, consistency (linearizability) and performance for untrusted cloud environments. Avocado achieves these properties based on TEEs, which, however, are primarily designed for securing limited physical memory (enclave) within a single-node system. Avocado overcomes this limitation by extending the trust of a secure single-node enclave to the distributed environment over an untrusted network, while ensuring that replicas are kept consistent and fault-tolerant in a malicious environment. To achieve these goals, we design and implement Avocado underpinning on the cross-layer contributions involving the network stack, the replication protocol, scalable trust establishment, and memory management. Avocado is practical: In comparison to BFT, Avocado provides confidentiality with fewer replicas and is significantly faster—4.5× to 65× for YCSB read and write heavy workloads, respectively.

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BibTeX
@inproceedings {273847,
author = {Maurice Bailleu and Dimitra Giantsidi and Vasilis Gavrielatos and Do Le Quoc and Vijay Nagarajan and Pramod Bhatotia},
title = {Avocado: A Secure In-Memory Distributed Storage System},
booktitle = {2021 {USENIX} Annual Technical Conference ({USENIX} {ATC} 21)},
year = {2021},
isbn = {978-1-939133-23-6},
pages = {65--79},
url = {https://www.usenix.org/conference/atc21/presentation/bailleu},
publisher = {{USENIX} Association},
month = jul,
}