Method of encryption and decryption with block number dependant key sets, each set having a different number of keys
US6917684B1 · kind B1 · utility
48Cited by
9References
10Claims
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Key dates
| Filing date | Aug 15, 2000 |
| Grant date | Jul 12, 2005 |
| Priority date | — |
| Expiry date | Jun 7, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/24
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The subkey data generating unit 101 has two different subkey key generation processes. When encrypting a (T*n)th plaintex block (where T denotes a predetermined cycle and n is a positive integer), sixteen sets of subkey data are generated. In all other cases, two sets of subkey data are generated. The encrypting unit 100 encrypts the plaintex using the generated sixteen or two sets of subkey data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.