发明名称 |
CIPHER SYSTEM, CIPHER METHOD, AND CIPHER PROGRAM |
摘要 |
The present invention aims to allow for addition of an attribute category without reissuing a public parameter. A cryptographic system 10 uses an indexing technique in dual system encryption in dual pairing vector spaces. Specifically, for a transmission-side vector t j for index j, the cryptographic system 10 sets information J assigned to the index j in advance as a coefficient of a predetermined basis vector. For a reception-side vector for index j' corresponding to the index j, the cryptographic system 10 sets information J' having an inner-product of 0 with the information J as a coefficient of a basis vector corresponding to the predetermined basis vector. |
申请公布号 |
EP2824652(B1) |
申请公布日期 |
2016.10.19 |
申请号 |
EP20130757621 |
申请日期 |
2013.03.01 |
申请人 |
MITSUBISHI ELECTRIC CORPORATION;NIPPON TELEGRAPH AND TELEPHONE CORPORATION |
发明人 |
TAKASHIMA, KATSUYUKI;OKAMOTO, TATSUAKI |
分类号 |
H04L9/30 |
主分类号 |
H04L9/30 |
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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