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This is a great explanation. I wish I would've had something like this when I started out haha. Another good one is the mixing colour analogy.

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This talk, http://pyvideo.org/video/1778/crypto-101, given by Laurens Van Houtven at PyCon US 2013, is a fantastic intro to crpytography and he uses the mixing color analogy as one of his examples.

Thanks I'll watch that when I get home :-)

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