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Networks with homogeneous routing nodes are constantly at risk as any vulnerability found against a node could be used to compromise all nodes. Introducing diversity among nodes can be used to address this problem. With few variants, the choice of assignment of variants to nodes is critical to the overall network resiliency. We present the Diversity(More)
The article describes the design of the Community Seismic Network, which is a dense open seismic network based on low cost sensors. The inputs are from sensors hosted by volunteers from the community by direct connection to their personal computers, or through sensors built into mobile devices. The server is cloud-based for robustness and to dynamically(More)
The increasing number of cyber attacks against critical infrastructures, which typically require large state and long system lifetimes, necessitates the design of systems that are able to work correctly even if part of them is compromised. We present the first practical survivable intrusion tolerant replication system, which defends across space and time(More)
As the Internet becomes an important part of the infrastructure our society depends on, it is crucial to construct networks that are able to work even when part of the network is compromised. This paper presents the first practical intrusion-tolerant network service, targeting high-value applications such as monitoring and control of global clouds and(More)
Modern web services such as Facebook are made up of hundreds of systems running in geographically-distributed data centers. Each system needs to be allocated capacity, configured, and tuned to use data center resources efficiently. Keeping a model of capacity allocation current is challenging given that user behavior and software components evolve(More)
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—Networks with homogeneous routing nodes are constantly at risk as any vulnerability found against a node could be used to compromise all nodes. Introducing diversity among nodes can be used to address this problem. With few variants, the choice of assignment of variants to nodes is critical to the overall network resiliency. We present the Diversity(More)
The dramatic success and scaling of the Internet was made possible by the core principle of keeping it simple in the middle and smart at the edge (or the end-to-end principle). However, new applications bring new demands, and for many emerging applications, the Internet paradigm presents limitations. For applications in this new generation of Internet(More)
The detection of hazardous radiation sources is difficult for several reasons. Sensors detect when photons, generated randomly by sources, strike crystals and so sensors don't get continuous information streams. Radiation emanates from threats but also from walls, the ground and medical patients undergoing radiation treatment. There may be multiple, mobile,(More)