Herein you will find graphs showing entropy analysis graphs for different examples and data types. Entropy is the randomness of data when comparing bytes with neighbouring bytes. Entropy analysis code slides a window of N bytes across the data determining how different byte B is from byte B+1. This helps in determining if your target data is compressed, encrypted or finding keys and other distinctions.
example.sh is used to generate. It utilizes cyphunks libdisorder branch (only adds a util to pipe a file through) and gnuplot.
Here is a sample of results. See repository for all samples.
Random 4MB JPEG
Random (dd if=/dev/random of=random bs=1m count=4)
Random Ziped. common zip meta data cause larger Y scale
Random 4MB JPEG encrypted with RC2
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