Credit card security technique

摘要: A technique for secure electronic commerce is disclosed wherein a transaction initiator (26) has primary identifier and list of secondary identifiers stored therein, each which valid single transaction. An identification center (36) receives the verification numbers verifies that number appropriate current using number. The comprises an enhanced monetary card, such as credit card or value includes embedded processor, provides are in lookup table, also available to center. values table indexed according counter preferably communicated without encryption challenge. In some embodiments other types hardware personal computer conjunction with memory CDr storing software.