Patent ID: 8510228

Claim:
A data processing method of electronic cash transfer transaction, characterized in that said method comprises the following steps: a card for transfer-out generates a first digital signature based on the information provided by a card for transfer-in, and the card for transfer-in generates a second digital signature based on the information provided by the card for transfer-out and sends the second digital signature to the card for transfer-out via a terminal; the card for transfer-out verifies the second digital signature, and executes a transfer-out operation if it is right; the card for transfer-out generates a first transaction validation code associated with the card for transfer-in and sends the first digital signature and the first transaction validation code to the card for transfer-in via the terminal; the card for transfer-in verifies the first digital signature, and executes a transfer-in operation if it is right; and the card for transfer-in generates a second transaction validation code associated with the card for transfer-out and sends the second transaction validation code to the card for transfer-out via the terminal, to confirm that the transfer transaction is successful; wherein the card for transfer-out and the card for transfer-in verifies the second and the first digital signature by using the public key certificate of the card for transfer-in and the public key certificate of the card for transfer-out respectively, and wherein the card for transfer-out obtains the public key certificate of the card for transfer-in according to the following steps: obtaining a card-issuing bank public key certificate of the card for transfer-in based on the CA public key certificate internally stored in the card for transfer-out; and obtaining the public key certificate of the card for transfer-in by using the obtained card-issuing bank public key certificate of the card for transfer-in.