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Re:The One-Time Pad and the Index of Coincidence by javamonn on Monday April 13, 2015 @06:21PM (#9370895)
Friedman's original paper is well worth the read, and toy Vogel implementation if you have time! [0]

[0] waring, pdf: http://math.boisestate.edu/~liljanab/MATH509/IndexCoincidenc...