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    • 5. 发明申请
    • ENCRYPTION DEVICE AND KEY DISTRIBUTION DEVICE AND SYSTEM
    • 加密设备和密钥分发设备和系统
    • WO2005088891A3
    • 2006-06-01
    • PCT/JP2005004873
    • 2005-03-14
    • MATSUSHITA ELECTRIC IND CO LTDNAKANO TOSHIHISAISHIHARA HIDESHITATEBAYASHI MAKOTO
    • NAKANO TOSHIHISAISHIHARA HIDESHITATEBAYASHI MAKOTO
    • H04L9/00H04L9/08
    • H04L9/083H04L9/3247H04L2209/60
    • A key distribution system distributes key data for using content to a second encryption device that has been legitimately outsourced processing by a first encryption device. The first encryption device acquires permission information indicating that the first encryption device has permission to use the content, generates certification information by making an irreversible alteration the to permission information, and transmits the permission information and the certification information to the second encryption device. The second encryption device receives the permission information and the certification information, sends them to a key distribution device, and acquires the key data from the key distribution device. The key distribution device receives the permission information and the certification information, judges whether or not the certification information was generated by the by the first encryption device, and if judging in the affirmative, transmits the key data to the second encryption device.
    • 密钥分配系统将用于使用内容的密钥数据分配给已被第一加密设备合法外包处理的第二加密设备。 第一加密装置获取表示第一加密装置具有允许使用内容的许可信息,通过对许可信息进行不可逆变更来生成认证信息,并将许可信息和认证信息发送到第二加密装置。 第二加密装置接收许可信息和认证信息,将其发送到密钥分发装置,并从密钥分发装置获取密钥数据。 密钥分配装置接收许可信息和认证信息,判断认证信息是否由第一加密装置生成,并且如果肯定地判断,则将密钥数据发送到第二加密装置。