Confidential information processing host device and confidential information processing method
US8024583B2 · kind B2 · utility
2Cited by
4References
20Claims
0Family size
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Key dates
| Filing date | Apr 25, 2006 |
| Grant date | Sep 20, 2011 |
| Priority date | — |
| Expiry date | Jan 10, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/60
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In the case where a target device stores: m keys {Ka1, . . . , Kam} (m is a natural number) in a manner that the Kai (i is a natural number satisfying 1≦i≦m) is encrypted with the Ka (i−1); and n keys {Kb1, . . . , Kbn} (n is a natural number) in a manner that the Kbj (j is a natural number satisfying 1≦j≦n) is encrypted with the Kb (j−1), a confidential information processing unit is caused to perform a processing of re-encrypting the encrypted key Enc (Kai, Ka (i−1)), which has been encrypted with the Ka (i−1), by using the Kb (j−1) and outputting as an encrypted key Enc (Kai, Kb (j−1)).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.