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    +1 visualizing is the key. I always liked the example with a picture of a penguin in the ECB section of Block cipher article). An automated software rarely can detect such regularities Commented May 6, 2012 at 7:44
  • Eh? The point of that visualisation is to show that the distribution is not okay. The naïve shuffle algorithm makes certain orders much more likely than others. Notice how far more to the right the 2341, 2314, 2143 and 1342 bars extend? Commented Jan 2, 2016 at 16:16