| 摘要 |
PROBLEM TO BE SOLVED: To need a device and a software for connecting an IC card to a network terminal to be used, but a method for keeping a key on the IC card can reduce the risk that a third parson abuses by carrying the IC card at all times. SOLUTION: This system encrypts transmission information by a portable terminal connected to a network terminal. This electronic signature system by a portable terminal, which inputs information to an information input picture of the network terminal by input means, encrypts information to be transmitted by a secret key housed in the portable terminal when transmitting the input information from the network terminal to a destination, attaches an electronic certification of a public key housed in the portable terminal and transmits, is provided. COPYRIGHT: (C)2003,JPO
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