Diehard
Another widely used suite of random number tests is known as Diehard. This
suite was invented by George Marsaglia in 1995 (Kenny, 2005). It was made to be an
update for the original random number test suite, Knuth. Knuth is named after Donald
Knuth and was published in the 1969 book The Art of Computer Programming, Volume
2
. Knuth’s tests were designed before cryptography became a major industry, and the
suite was later considered to be too easy to pass for situations where vast quantities of
random numbers were needed. Diehard was designed to be more difficult to pass than
Knuth’s suite, fulfilling the role of a general-purpose battery for detecting non-
randomness. All of the tests are available free online, so they can be easily used to test
any number sequence (Marsaglia, 2005). The Diehard suite has not been updated since its
inception in 1995, but is still a widely used test suite (Kenny, 2005).
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