Information generation apparatus, method, program, and recording medium for deriving a decryption key from another decryption key
US8619980B2 · kind B2 · utility
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Key dates
| Filing date | Apr 23, 2010 |
| Grant date | Dec 31, 2013 |
| Priority date | — |
| Expiry date | May 21, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/0847
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
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).
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