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Numerous routing protocols have been designed and subjected to model checking and simulations. However, model checking the design or testing the simulator-based prototype of a protocol does not guarantee that the implementation is free of bugs and vulnerabilities. Testing implementations beyond their basic functionality (also known as adversarial testing) can increase protocol robustness. We focus...
Debugging distributed systems is challenging. Although incremental debugging during development finds some bugs, developers are rarely able to fully test their systems under realistic operating conditions prior to deployment. While deploying a system exposes it to realistic conditions, debugging requires the developer to: (i) detect a bug, (ii) gather the system state necessary for diagnosis, and...
Security and performance are critical goals for distributed systems. The increased design complexity, incomplete expertise of developers, and limited functionality of existing testing tools often result in bugs and vulnerabilities that prevent implementations from achieving their design goals in practice. Many of these bugs, vulnerabilities, and misconfigurations manifest after the code has already...
Popular online services such as social networks, e-commerce and bidding are routinely hosted in large-scale data centers. Group communication systems (e.g., multicast) and distributed key-value stores are among some of the most essential building blocks for these services. Due to their scaling requirements, overlay networks such as distributed hash tables (DHTs) have been traditionally used in such...
The proliferation of peer-to-peer systems has led to the increasing deployment of dynamic, adaptive overlay networks that are designed to preserve application performance goals. While such networks provide increased performance and resiliency to benign faults, they are susceptible to attacks conducted by compromised overlay nodes, especially those targeting the adaptation mechanisms. In this work,...
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