Data updating method and data updating system
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United States of America Patent
Stats
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Sep 4, 2007
Grant Date -
Nov 20, 2003
app pub date -
May 14, 2003
filing date -
May 20, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention provides a data updating method and a data updating system, which can update data of an IC card through a network without mistaking the IC card targeted for updating. When each of issuer client authentication, personal authentication, issuer server authentication and device authentication is performed, a server transmits update data encrypted by a public key used for the device authentication to a client. Then, the client outputs the encrypted update data to an IC card. In the IC card, the update data is decrypted by a secret key used for the device authentication. Based on the decrypted update data, rewriting is carried out in the IC card.
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