Reports that readers cracked the new 1972 credit card code and publishes the prefix table, advertises an induction-coupler earpiece for quieter blue-boxing, and debunks folk methods for detecting a wiretap. Read more →

Explains the redesigned 1972 credit card billing code and a separate ‘Code Billing System’ exploit, encourages readers to prank-call Southern Bell’s chief of security, and gives an early write-up of what would become the ‘black box’ for receiving free long-distance calls. Read more →