Invention Grant
US08619980B2 Information generation apparatus, method, program, and recording medium for deriving a decryption key from another decryption key
有权
用于从另一解密密钥导出解密密钥的信息生成装置，方法，程序和记录介质
- Patent Title: Information generation apparatus, method, program, and recording medium for deriving a decryption key from another decryption key
- Patent Title (中): 用于从另一解密密钥导出解密密钥的信息生成装置，方法，程序和记录介质
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Application No.: US13258165Application Date: 2010-04-23
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Publication No.: US08619980B2Publication Date: 2013-12-31
- Inventor: Koutarou Suzuki , Ryo Nishimaki
- Applicant: Koutarou Suzuki , Ryo Nishimaki
- Applicant Address: JP Tokyo
- Assignee: Nippon Telegraph and Telephone Corporation
- Current Assignee: Nippon Telegraph and Telephone Corporation
- Current Assignee Address: JP Tokyo
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2009-106009 20090424
- International Application: PCT/JP2010/057279 WO 20100423
- International Announcement: WO2010/123116 WO 20101028
- Main IPC: H04L9/00
- IPC: H04L9/00 ; H04K1/00 ; H04L9/28 ; H04L29/06 ; H04L9/32
Abstract:
Hierarchical cryptography expressed in a general semiordered structure other than a tree structure is implemented. In information generation, random numbers σv and (σvj)jεw(v)εZq are generated; main information kv=σvΣiε{1, . . . , N-1}\w(v)vibi*+bN* is calculated; and derivation information kvj=σvjΣiε{1, . . . , N-1}\w(v)vibi*+bj* is calculated for each jεw(v). In information derivation, random numbers σu and (σuj)jεw(u)εZq are generated; main information ku=σuΣiεw(v)\w(u)uikvi+kv is calculated; and derivation information kuj=σujΣiεw(v)\w(u)uikvi+kvj is calculated for each jεw(v).
Public/Granted literature
- US20120027206A1 INFORMATION GENERATION APPARATUS,METHOD, PROGRAM, AND RECORDING MEDIUM THEREFOR Public/Granted day:2012-02-02
Information query
