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ENCRYPTION SYSTEM, MASTER KEY UPDATING DEVICE, AND MASTER KEY UPDATING PROGRAM
ENCRYPTION SYSTEM, MASTER KEY UPDATING DEVICE, AND MASTER KEY UPDATING PROGRAM
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机译:加密系统,主密钥更新设备和主密钥更新程序
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摘要
A master key update apparatus (400) acquires a master public key mpk including a basis B and a master secret key msk including a basis B which is different from the basis B included in the master public key mpk. The master key update apparatus (400) updates the basis B included in the master public key mpk with updating information upk so as to generate a new master public key mpk, and updates the basis B included in the master secret key msk with the updating information upk so as to generate a new master secret key msk.
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