发明名称 |
Key-updating method, encryption processing method, key-insulated cryptosystem and terminal device |
摘要 |
In a key-insulated cryptosystem according to the present invention, a plurality of external devices are associated with a number of updates of a terminal secret key which has already been updated, and a different piece of secret information is stored in each of the external devices. In addition, a key-updating method in the key-insulated cryptosystem according to the present invention includes steps of: selecting one of the external devices depending on the number of updates of the terminal secret key; and causing the selected external device to generate key-updating information used for updating the terminal secret key based on the number of updates and the stored secret information.
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申请公布号 |
US8270615(B2) |
申请公布日期 |
2012.09.18 |
申请号 |
US20100727875 |
申请日期 |
2010.03.19 |
申请人 |
HANAOKA YUMIKO;NTT DOCOMO, INC. |
发明人 |
HANAOKA YUMIKO |
分类号 |
H04L29/06 |
主分类号 |
H04L29/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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