Extended key generator, encryption/decryption unit, extended key generation method, and storage medium
US6891950B1 · kind B1 · utility
25Cited by
16References
4Claims
0Family size
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Key dates
| Filing date | Aug 31, 2000 |
| Grant date | May 10, 2005 |
| Priority date | — |
| Expiry date | Dec 25, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/24
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
There are disclosed an extended key generator, encryption/decryption unit, and storage medium, in which as each of key transform functions, a transform process is done by an S box (substitution table) on the basis of a first key obtained from the inputted key, and an adder computes a corresponding one of extended keys on the basis of a value obtained by shifting the transformed result of the S box to the left, and a second key obtained from the inputted key.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.