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Using these codes you can make rage faces on Facebook. Encrypting Pictures Using Chaotic Cellular Automata. It’s been more than ten years now since the idea emerged of using chaos to encrypt messages. The approach is straightforward. Start with a message, superimpose it on a chaotic signal and send. If the chaos is carefully chosen, this signal can seem random and so look like background noise. To reveal the original message, the receiver must be in possession of the same chaotic signal and simply needs to subtract this from the encrypted message. Voila! Today, Marina Jeaneth Machicao and a few pals at the University of San Paul in Brazil reveal a straightforward way of extending this method to images. Their idea is to use a cellular automaton to generate a pseudorandom signal.

The trick, of course, is to find a rule that generates a pseudorandom output so that the resulting grid looks like noise. These guys examine a number of automata to see which generates the most random output. One crucial point is that the output of this automata is precisely determined by its starting state. Welcome to The World of Holophonics™ Journalism in the Age of Data: A Video Report on Data Visualization by Geoff McGhee. Sacred Geometry.