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    Threat Adaptive Byzantine Fault Tolerant State-Machine Replication

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    Type
    Conference Paper
    Authors
    Silva, Douglas Simões
    Graczyk, Rafal
    Decouchant, Jérémie
    Völp, Marcus
    Esteves-Verissimo, Paulo
    KAUST Department
    RC3 - KAUST
    Date
    2021
    Online Publication Date
    2021-11-22
    Print Publication Date
    2021-09
    Permanent link to this record
    http://hdl.handle.net/10754/673736
    
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    Abstract
    Critical infrastructures have to withstand advanced and persistent threats, which can be addressed using Byzantine fault tolerant state-machine replication (BFT-SMR). In practice, unattended cyberdefense systems rely on threat level detectors that synchronously inform them of changing threat levels. However, to have a BFT-SMR protocol operate unattended, the state-of-the-art is still to configure them to withstand the highest possible number of faulty replicas $f$ they might encounter, which limits their performance, or to make the strong assumption that a trusted external reconfiguration service is available, which introduces a single point of failure. In this work, we present ThreatAdaptive the first BFT-SMR protocol that is automatically strengthened or optimized by its replicas in reaction to threat level changes. We first determine under which conditions replicas can safely reconfigure a BFT-SMR system, i.e., adapt the number of replicas $n$ and the fault threshold $f$ so as to outpace an adversary. Since replicas typically communicate with each other using an asynchronous network they cannot rely on consensus to decide how the system should be reconfigured. ThreatAdaptive avoids this pitfall by proactively preparing the reconfiguration that may be triggered by an increasing threat when it optimizes its performance. Our evaluation shows that ThreatAdaptive can meet the latency and throughput of BFT baselines configured statically for a particular level of threat, and adapt 30% faster than previous methods, which make stronger assumptions to provide safety.
    Citation
    Silva, D. S., Graczyk, R., Decouchant, J., Volp, M., & Esteves-Verissimo, P. (2021). Threat Adaptive Byzantine Fault Tolerant State-Machine Replication. 2021 40th International Symposium on Reliable Distributed Systems (SRDS). doi:10.1109/srds53918.2021.00017
    Sponsors
    This work is partially funded by FNR through Pearl grant IISD and the Core project ThreatAdapt C18/IS/1269492
    Publisher
    IEEE
    Conference/Event name
    2021 40th International Symposium on Reliable Distributed Systems (SRDS)
    ISBN
    978-1-6654-3820-9
    DOI
    10.1109/SRDS53918.2021.00017
    Additional Links
    https://ieeexplore.ieee.org/document/9603657/
    https://ieeexplore.ieee.org/document/9603657/
    https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=9603657
    https://repository.tudelft.nl/islandora/object/uuid%3Ad95fbaa3-cbfa-4722-a9a9-ab228fc9dc30/datastream/OBJ/download
    ae974a485f413a2113503eed53cd6c53
    10.1109/SRDS53918.2021.00017
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