Patent ID: 7584153

Claim:
A system for securing financial transactions with payment cards, comprising: a payment card for use at least in card-not-present financial transactions with a merchant, and that is not itself capable of cryptographic calculations; a precomputed set of dynamic variable card verification values (CVVs) disposed electronically in the payment card, and in which the CVVs are distinct and separate from a personal account number and not transmitted in card-present financial transactions; a user display for visually presenting any said CVV permanently stored in a table and individually selected on the payment card; a user trigger for starting an electronic selection of a next CVV in a table loaded previously by a cryptographic process and calculated outside the payment card, and for causing a new value of said CVVs to be visually presented on the user display; a timer connected to the user trigger and providing a limit on the frequency at which a new CVV can be generated or retrieved; and a payment infrastructure connected through said merchant and providing for financial transaction authorizations based at least on the validity of said CVV values according to said cryptographic process, and including at least a payment authorization, personalization, or card manufacturing component that includes said cryptographic process for pre-computing all said CVV values external to the payment card and that can thereafter be visually presented on the user display of respective payment cards.