Back when the walls had ears, spies would store their information in a hidden cache and pass along the location via code. Now, a New York City artist is doing the same with USB flash drives, five of which he's already injected into the city's brick walls. While there some obvious logistical reasons we'd avoid using his creation (not to mention worries about AutoRun in older PCs) we'll definitely keep the idea in mind for Engadget informants who are particularly paranoid about their anonymity. See the first five drives' not-so-secret locations in photos at our source links.

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New York City walls play host to covert thumbdrives