Electronic settlement system, settlement management device, store device, client device, data storage device, computer program, and storage medium

Abstract

An effective electronic settlement system in which the number of checks is small. The electronic settlement system includes a data storage device such as an IC card in which value information is stored, a client device provided with an information input/output function to the data storage device, a store device for providing commodities or services, a settlement management device for managing settlement between the data storage device and the store device, and a communication system for connecting the client device, the store device, and the settlement management device so as to enable bidirectional communication. The settlement management device creates, based on settlement request information from the store device, settlement information for making settlement by the data storage device, subjects the settlement information to an encryption processing by using a common key shared by the settlement management device and the data storage device, and transmits the settlement information subjected to the encryption processing to the client device, and the client device outputs the settlement information received from the settlement management device to the data storage device.

1 . A settlement management device which can update value information stored in a data storage device through a client device, comprising: 
 an encryption part for subjecting value update information of the data storage device to an encryption processing by using a common key shared by the settlement management device and the data storage device; and    a transmitting part for transmitting the value update information subjected to the encryption processing to the client device and, wherein the client device inputs the received value update information to the data storage device, and for transmitting settlement completion information to the client device.    
   
   
       2 . A settlement management device according to  claim 1 , wherein the settlement management device creates a fifth signature indicating validity of the value update information by using a private key of the settlement management device, and transmits the value update information with the fifth signature to the client device, and wherein the client device checks validity of the fifth signature received from the settlement management device by using a public key corresponding to the private key of the settlement management device, and then inputs the value update information to the data storage device.  
   
   
       3 . A computer program encoded on a computer readable medium, the computer program including executable instruction that when executed causes a computer to function as a settlement management device for updating value information stored in a data storage device through a client device, wherein the settlement management device subjects value update information of the data storage device to an encryption processing by using a common key shared by the settlement management device and the data storage device, and transmits the value update information subjected to the encryption processing to the client device, and wherein the client device inputs the received value update information to the data storage device, and transmits settlement completion information to the client device.  
   
   
       4 . A computer readable storage medium for storing a computer program for causing a computer to function as a settlement management device which can update value information stored in a data storage device through a client device, wherein the settlement management device subjects value update information of the data storage device to an encryption processing by using a common key shared by the settlement management device and the data storage device, and transmits the value update information subjected to the encryption processing to the client device, and wherein the client device inputs the received value update information to the client device.  
   
   
       5 . A settlement management device according to  claim 1 , wherein the settlement completion information includes a payment completion screen presented to the client device.  
   
   
       6 . A computer program according to  claim 3 , further comprising causing the computer to transmit settlement completion information in response to a request by the client device.  
   
   
       7 . A computer readable storage medium according to  claim 4 , further comprising causing the computer to transmit settlement completion information in response to a request by the client device.