Card payment for an Internet transaction, uses code table prepared when card is manufactured with server interrogation of user who must return correct entries from the code table

摘要

The user cards (WSCn) carry a code table (TCn) and an identification code (CIn), which is recorded at the center (CEC) which manages card fabrication and controls transactions. The user transmits the ID code (CIn) to the center which sends positions of random elements. The user selects the required elements and returns them to the control center. If they match the transaction is authorized.