Via WiredBlog -
It's well known that digital photos, like PDF files and Word docs, can contain meta data that leak information the publisher didn't intend to reveal. Less acknowledged is that some cameras also embed a small thumbnail image of the original photo that can survive subsequent tinkering and cropping -- allowing a before-and-after comparison.
Hacker Tonu Samuel has put together a nifty demonstration of this on his Estonia-based website. He's written a web crawler that's scouring the internet for images with hidden thumbnails, and displaying both the final image and the uncensored thumbnail to a waiting world.
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