Provided is a method of and system for settling signatureless payment of a
slip of bank card sales in a mobile terminal such as a cellular phone, a
personal digital assistant, and a smart phone, having a mobile IC
(Integrated Circuit) chip card, to then be printed on a transaction
approval sales slip, to thereby make personal authentication completed
and prevent the sales slip from being forged or fabricated, without
signing on a customer's autographical signature of the sales slip. The
signatureless payment settlement system has an algorithm for producing a
personal authentication value in an IC chip card mounted on the mobile
terminal including the cellular phone or PDA (Personal Digital
Assistant), and receives a card issuing company key, card issuing
information, a card password, an IC chip card produced random number to
produce a personal authentication value. Then, the signatureless payment
settlement system transmits the generated authentication value to the
mobile payment settlement terminal in a card affiliated shop together
with the card information through an IR (Infrared Ray), RF (Radio
Frequency), or bluetooth communication, to then make the personal
authentication value printed on the customer signature column of the
sales slip output from the credit card inquiring machine (CAT) or the POS
(Point of Sales) system, at the time when a transaction is approved.
Accordingly, the signatureless payment settlement system solves
inconveniences that a customer who uses a card should sign on a slip of
sales at a card affiliated shop, and shortens a card transaction approval
time. Also, when a validity of transaction by use of a card is
challenged, a card issuing company can confirm the validity of the card
use for verification. As a result, the signatureless payment settlement
system can prevent forgery, fabrication, or falsification of the sales
slip, to thereby prevent an illegal card use.