method for bidirectional data transfer between a terminal and a smart card and smart card

摘要

The method involves the terminal writing a transfer value into an account state memory (2.11,2.21) in the chip card (1). A write monitoring value is written into a monitor memory at the latest at the time of the transfer value write and is cleared as soon as the transfer value has been completely stored in the account state memory. An Independent claim is also included for a cash chip card for bi-directional data transfer.