I was reading about the IT problems of the recently arrested, alleged Russian spies, and I wondered if they could have managed secret communications better with Mathematica
One of the claims was that they were using digital steganography tools that kept crashing. I wanted to see how quickly I could implement digital image steganography in Mathematica
using a method known as "least significant bit insertion".
The idea of steganography is to hide messages within other information so that no one notices your communications. The word itself comes from a Latin-Greek combination meaning "covered writing", from earlier physical methods that apparently included tattooing a message on a messenger's head before letting him grow his hair back to hide it. In the case of digital steganography, it is all done in the math.