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What is Visual Cryptography Visual Cryptography is a special encryption technique to hide information in images in such a way that it can be decrypted by the human vision if the correct key image is used. The technique was proposed by Naor and Shamir in 1994. Visual Cryptography uses two transparent images.

This site has some really neat pictures and a video detailing Babbage's Difference Engine. The pictures are gigapixel, so they are incredibly detailed.

Wow. That's a lot of zoom.

And here's the collection of tweets from me, @maddagaska, and Cory Doctor about the choice of terms "security" and "surveillance."

Thanks to Cliff Anderson from the library for putting together this resource.