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Title: Wire Pirates

Essay Details

Subject: Technology
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Date: April 15, 2009
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Length: 4 / 1091
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Essay text:

When the cards were first introduced, credit card consisted of a sequence of digits (usually area code, number and billing office code) followed by a "check digit" that depended on the other digits. Operators could easily perform the math to determine whether a particular credit-card number was valid...

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Operators could easily perform the math to determine whether a particular credit-card number was valid. But also phreaks could easily figure out how to generate the proper check digit for any given telephone number. So in 1982 AT&T finally put in place a more robust method...

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