May 13, 2024, 11:04 a.m. | B. Schneier

Schneier on Security www.schneier.com

Back in the 1960s, if you played a 2,600Hz tone into an AT&T pay phone, you could make calls without paying. A phone hacker named John Draper noticed that the plastic whistle that came free in a box of Captain Crunch cereal worked to make the right sound. That became his hacker name, and everyone who knew the trick made free pay-phone calls.


There were all sorts of related hacks, such as faking the tones that signaled coins dropping into …

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