Skip to Content

May 1, 1983 · TAP

TAP No. 85 - 12th Anniversary Issue: The Credit Card Code - 1983

TAP No. 85 - 12th Anniversary Issue: The Credit Card Code - 1983

Marking TAP’s 12th anniversary, Cheshire Catalyst reports that the annual ‘credit card code’ has not yet been cracked and reviews the switch from ‘credit card’ to ‘Calling Card’ branding, which he attributes partly to liability concerns and partly to new automated touch-tone billing systems that eliminated operator surcharges. He describes the two-number format printed on the new cards (a domestic calling number and an international number) and invites readers to help crack the checksum. A reader letter references a computer-security zine and reacts to industry pushback (an ‘ATM Report’ newsletter piece) over publications discussing ATM and credit card vulnerabilities.

Project Page Open Link

Latest Posts