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    • 8. 发明授权
    • Secure data transfer method of using a smart card
    • 使用智能卡的安全数据传输方法
    • US07360091B2
    • 2008-04-15
    • US10602696
    • 2003-06-25
    • Makoto AikawaYutaka TakamiShinichiro Fukushima
    • Makoto AikawaYutaka TakamiShinichiro Fukushima
    • G07B15/00H04K1/00H04L9/00
    • G06Q20/3823G06Q20/06G06Q20/367G06Q20/3674
    • A smart card and a settlement terminal are provided by which, when common-key cryptography is used for value transfer between smart cards, the security of the whole system can be improved by enabling easy updating of a cryptographic key used for the value transfer. A smart card transmits/receives value data to/from another smart card. The smart card includes an information accumulating unit for accumulating value data, a transfer key used to update the value data, and an update key used to update the transfer key; a communication unit for receiving a transfer key encrypted by use of the update key, the transfer key being transmitted from another smart card; and an arithmetic processing unit for decrypting the encrypted transfer key by use of the update key to update the transfer key accumulated in the information accumulating unit by use of the decrypted transfer key.
    • 提供一种智能卡和结算终端,当通用密钥加密被用于智能卡之间的价值转移时,可以通过使得能够容易地更新用于价值转移的加密密钥来提高整个系统的安全性。 智能卡向另一个智能卡发送/接收价值数据。 智能卡包括用于累积值数据的信息累积单元,用于更新值数据的传送密钥和用于更新传送密钥的更新密钥; 通信单元,用于接收通过使用所述更新密钥加密的传送密钥,所述传送密钥从另一个智能卡发送; 以及算术处理单元,用于通过使用更新密钥对加密的传送密钥进行解密,以通过使用解密的传送密钥来更新在信息累积单元中累积的传送密钥。