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This paper presents a traffic characterization study of the popular video sharing service, YouTube. Over a three month period we observed almost 25 million transactions between users on an edge network and YouTube, including more than 600,000 video downloads. We also monitored the globally popular videos over this period of time. In the paper we examine(More)
Web 2.0 has brought about several new applications that have enabled arbitrary subsets of users to communicate with each other on a social basis. Such communication increasingly happens not just on Facebook and MySpace but on several smaller network applications such as Twitter and Dodgeball. We present a detailed characterization of Twitter, an application(More)
In this paper we collect and analyze traceroute measurements 1 to show that large content providers (e.g., Google, Microsoft, Yahoo!) are deploying their own wide-area networks, bringing their networks closer to users, and bypassing Tier-1 ISPs on many paths. This trend, should it continue and be adopted by more content providers, could flatten the Internet(More)
We present the first large-scale analysis of failures in a data center network. Through our analysis, we seek to answer several fundamental questions: which devices/links are most unreliable, what causes failures, how do failures impact network traffic and how effective is network redundancy? We answer these questions using multiple data sources commonly(More)
Latent sector errors (LSEs) refer to the situation where particular sectors on a drive become inaccessible. LSEs are a critical factor in data reliability, since a single LSE can lead to data loss when encountered during RAID reconstruction after a disk failure or in systems without redundancy. LSEs happen at a significant rate in the field [Bairavasundaram(More)
The large-scale collection and exploitation of personal information to drive targeted online advertisements has raised privacy concerns. As a step towards understanding these concerns, we study the relationship between how much information is collected and how valuable it is for advertising. We use HTTP traces consisting of millions of users to aid our(More)
Many smartphone operating systems implement strong sandboxing for 3rd party application software. As part of this sandboxing, they feature a permission system, which conveys to users what sensitive resources an application will access and allows users to grant or deny permission to access those resources. In this paper we survey the permission systems of(More)
Targeted attacks on civil society and non-governmental organizations have gone underreported despite the fact that these organizations have been shown to be frequent targets of these attacks. In this paper, we shed light on targeted malware attacks faced by these organizations by studying malicious e-mails received by 10 civil society organizations (the(More)
Despite our growing reliance on mobile phones for a wide range of daily tasks, we remain largely in the dark about the operation and performance of our devices, including how (or whether) they protect the information we entrust to them, and with whom they share it. The absence of easy, device-local access to the traffic of our mobile phones presents a(More)