List of security hacking incidents
1971 — a Vietnam War veteran named John Draper discovers that the give-away whistle in Cap'n Crunch cereal boxes perfectly reproduces a 2600 hertz tone. Draper builds a "blue box" that, when used with the whistle and sounded into a phone receiver, allows phreaks to make free calls. Shortly afterwards, Esquire magazine publishes "Secrets of the Little Blue Box" with instructions for making a blue box, and wire fraud in the United States escalates.