Adam Pridgen

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This paper investigates changes over time in the behavior of Android ad libraries. Taking a sample of 114,000 apps, we extract and classify their ad libraries. By considering the release dates of the applications that use a specific ad library version, we estimate the release date for the library, and thus build a chronological map of the permissions used(More)
Weibo and other popular Chinese microblogging sites are well known for exercising internal censorship, to comply with Chinese government requirements. This research seeks to quantify the mechanisms of this censorship: how fast and how comprehensively posts are deleted. Our analysis considered 2.38 million posts gathered over roughly two months in 2012, with(More)
Sensor networks are becoming increasingly pervasive. Existing methods of aggregation in sensor networks offer mostly standard mathematical operators over homogeneous data types. In this paper, we instead focus on supporting emerging scenarios in which applications will need to extract abstracted measurements from diverse sets of sensor network nodes. This(More)
Applications in mobile multi-agent systems require a high degree of confidence that code that runs inside the system will not be malicious and that any agents which are malicious can be identified and contained. Since the inception of mobile agents, this threat has been addressed using a multitude of techniques, but many of these implementations have only(More)
We present measurements and analysis of censorship on Weibo, a popular microblogging site in China. Since we were limited in the rate at which we could download posts, we identified users likely to participate in sensitive topics and recursively followed their social contacts. We also leveraged new natural language processing techniques to pick out trending(More)
As sensor networks become increasingly ubiquitous, we envision an instrumented environment that can provide varying amounts of information to mobile applications immersed within the network. Such a scenario deviates from existing deployments of sensor networks which are often highly application-specific and generally funnel information to a central(More)