Apparatus and method for cryptographic key expansion
US7711955B1 · kind B1 · utility
5Cited by
12References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 13, 2004 |
| Grant date | May 4, 2010 |
| Priority date | — |
| Expiry date | Jan 3, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/24
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An apparatus and method for cryptographic key expansion. According to a first embodiment, a cryptographic unit may include key storage configured to store an expanded set of cipher keys for a cipher algorithm, and a key expansion pipeline comprising a plurality of pipeline stages. During a key expansion mode of operation, each pipeline stage may be configured to perform a corresponding step of generating a member of the expanded set of cipher keys according to a key expansion algorithm. During a cipher mode of operation, a portion of the key expansion pipeline may be configured to perform a step of the cipher algorithm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.