If you can hide behind it, can you hide inside it?

If You Can Hide behind It, Can You Hide inside It?

Let K and L be compact convex sets in Rn. Suppose that, for a given dimension 1 ≤ d ≤ n − 1, every d-dimensional orthogonal projection of L contains a translate of the corresponding projection of K. Does it follow that the original set L contains a translate of K? In other words, if K can be translated to “hide behind” L from any perspective, does it follow that K can “hide inside” L? A compact...

Hide me if you can. Location Blurring on FxOS

Mobile phones become part of our daily life. Currently there are over two million applications in various Market Places. More and more of those require access to the location of a user in order to enhance her experience. However, if the information on where the device is might pose privacy threats. Geolocation may be used for targeted malware spreading, phishing, as well as posing a threat to t...

Activity Server: You can run but you can't hide

The activity server is a software utility that provides high-level information on what a user or a number of users are doing by combining data inputs from various sources. These sources are: 1) thejinger server, 2) the phone server, and 3) the location server. The finger server provides information on users' activities or lack thereof on hosts within a local network; the phone server abstracts ...

Nice work if you can get it.

If You Can Draw It, You Can Recognize It: Mirroring For Sketch Recognition

Humans use sketches drawn on paper, on a computer, or via hand gestures in the air as part of their communications. To recognize shapes in sketches, most existing work focuses on offline (post-drawing) recognition methods, trained on large sets of examples which serve as a plan library for the recognition method. These methods do not allow on-line recognition, and require a very large library (...