Another of his books, "Cybershock" (2000, 2001), is a non-technical look at the Defcon conference, hackers in general, Phreaking and the importance of computer security.
In 1990, Clough and Paul Mungo, a journalist, wrote Approaching Zero (1992) a book that covered the activities of phreakers, hackers and computer virus writers.
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Clough has written several books and articles dealing with phreakers, hackers and computer virus writers; credit card fraud; banking; and the activities of MI5 during World War II, specifically the Tyler Kent - Anna Wolkoff Affair (2005).
The film starts by reviewing the concept and the early days of phreaking, featuring anecdotes of phreaking experiences (often involving the use of a blue box) recounted by John Draper and Denny Teresi.