| 摘要 |
PURPOSE:To make it unnecessary to access a center during the supply of service, and in addition, to improve safety. CONSTITUTION:When a user inserts an IC card 6 into a terminal 1, and inputs a pass word Nc, a random number R is generated at the terminal 1, and the IC card 6 receives this, and when it coincides with the stored password, it generates the random number X, and produces a digital signature SU, and sends a stored digital signature SA of a card issuer corresponding to card device information IDU and the opening key nU of the card and these to the terminal 1. The terminal 1 verifies reception by using the stored opening key nA, and if it is correct, it makes user service start, and the terminal 1 transmits service information M such as a service charge and a date, etc., to the IC card 6. The IC card 6 stores this M in a memory, and simultaneously, it produces the digital signature SU, and sends it to the terminal 1. The terminal 1 verifies this, and if it is correct, it stores it in the memory, and it transmits the stored M service information etc., to the center at every definite period or every time data becomes some definite quantity. |
