Method and system to prevent fraudulent payment in credit/debit card transactions, and terminals therefor

摘要

The present invention enables secure, valid card payments in credit transactions to be performed, preventing fraudulent card use even in cases of loss or theft of a card or of information theft. During a transaction authorization process using a transaction terminal disposed in a credit transaction member store and connected with a host computer, user validation or credit administration is carried out by using a portable communication terminal to input to the host computer identity information which has been previously registered in the portable communication terminal and/or location information for the portable communication terminal.