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Distributed denial-of-service (DDoS) is a rapidly growing problem. The multitude and variety of both the attacks and the defense approaches is overwhelming. This paper presents two taxonomies for classifying attacks and defenses, and thus provides researchers with a better understanding of the problem and the current solution space. The attack(More)
Reducing power consumption for server-class computers is important, since increased energy usage causes more heat dissipation, greater cooling requirements, reduced computational density, and higher operating costs. For a typical data center, storage accounts for 27% of energy consumption. Conventional server-class RAIDs cannot easily reduce power(More)
Many network attacks forge the source address in their IP packets to block traceback. Recently, research activity has focused on packet-tracing mechanisms to counter this deception. Unfortunately, these mechanisms are either too expensive or ineffective against distributed attacks where traffic comes from multiple directions, and the volume in each(More)
Ficus is a flexible replication facility with optimistic concurrency control designed to span a wide range of scales and network environments. Optimistic con-currency control provides rapid local access and high availability of files for update in the face of disconnec-tion, at the cost of occasional conflicts that are only discovered when the system is(More)
SUMMARY This research proposes and tests an approach to engineering distributed le systems that are aimed at wide-scale, Internet-based use. The premise is that replication is essential to deliver performance and availability, yet the traditional conservative replica consistency algorithms do not scale to this environment. Our Ficus replicated le system(More)
—The Transmission Control Protocol (TCP) carries most Internet traffic, so performance of the Internet depends to a great extent on how well TCP works. Performance characteristics of a particular version of TCP are defined by the congestion control algorithm it employs. This paper presents a survey of various congestion control proposals that preserve the(More)
Constructing multipath routes in MANETs is important for providing reliable delivery, load balancing, and bandwidth aggregation. However, popular multipath routing approaches fail to produce spatially disjoint routes in a simple and cost-effective manner, and existing single-path approaches cannot be easily modified to produce multiple disjoint routes. In(More)
We recently used the Atom LEAP (a new energy measurement testbed developed at UCLA) as the foundation for CS 188, an undergraduate research seminar investigating potential trade-offs between security and energy consumption. Twenty-three students, in five groups, researched the energy costs of full disk encryption, network cryptography, and sandboxing(More)