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专利名称：INFORMATION GENERATING DEVICE,
INFORMATION GENERATING METHOD,AND INFORMATION GENERATINGPROGRAM AND STORAGE MEDIUMTHEREOF
发明人：SUZUKI, KOUTAROU,NISHIMAKI, RYO申请号：EP10767171申请日：20100423公开号：EP2424155A4公开日：20120815
摘要：Hierarchical cryptography expressed in a general semiordered structure otherthan a tree structure is implemented. In information generation, random numbers σv and(σvj)j∈w(v) ∈ Zq are generated; main information kv = σvΣ i ∈ {1, ..., N - 1} \\ w(v)vibi* + bN*is calculated; and derivation information kvj = σvjΣ i ∈ {1, ..., N - 1} \\ w(v)vibi* + bj* iscalculated for each j ∈ w(v). In information derivation, random numbers σu and(σuj)j∈w(u) ∈ Zq are generated; main information ku = σuΣ i ∈ w(v)= \\ w(u)uikvi + kv iscalculated; and derivation information kuj = σujΣ i ∈ w(v) \\ w(u)uikvi + kvj is calculated foreach j ∈ w(v).
申请人：NIPPON TELEGRAPH AND TELEPHONE CORPORATION
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