Abstract: The present invention provides a method for user authentication through the input of a password, the method for user authentication having enhanced security by determining whether or not a particular symbol or a symbol positioned in a particular position, among the symbols constituting the password, is input via a touch input including particular fingerprint information, in addition to determining the matching status of the password. Also provided is a user authentication method which can protect a user's personal information from others by using, in user authentication, the use status of a touch input including fingerprint information which is unlikely to be exposed by the others.

Abstract: A mobile card sharing service method and system with enhanced security are disclosed. A payment means sharing method comprises the steps of: registering a payment means related to a first mobile terminal; making a request for sharing of the payment means to at least one second mobile terminal which has been selected by the first mobile terminal; and registering a payment means related to the second mobile terminal if the second mobile terminal accepts the request for sharing of the payment means.

Abstract: A payment service method and system using code identification is disclosed. The payment service method includes the steps of: identifying first code information for product order; transmitting the first code information to a seller terminal; identifying second code information that is proposed for payment from the seller terminal for the first code information; and processing payment information, which is included in the second code information, through communication with a payment server.

Abstract: A shopping payment system comprises: a shopping server which stores information related to a plurality of products and provides a user terminal with the information related to the plurality of products; and a payment server which, if at least one of the plurality of products is selected by the user terminal and a payment request related to the selected at least one product is received, generates, in response to the payment request, at least one graphical code for payment for the at least one product on the basis of the information related to the at least one product. If the user mobile terminal recognizes the at least one graphical code and proceeds the payment procedure, the payment server authenticates the payment procedure, which has been proceeded by the mobile terminal, using the information related to the at least one product, which corresponds to the at least one graphical code.