Muti-cycle non-parallel data encryption engine
US5835599A · kind A · utility
87Cited by
11References
19Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 15, 1996 |
| Grant date | Nov 10, 1998 |
| Priority date | — |
| Expiry date | Apr 15, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/125
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A multi-cycle, non-parallel DES encryption scheme that supports CBC, OFB, CFB, and ECB modes of operation. Three independent cipher stages are coupled together in series in order to implement a high-speed DES core. Sixteen cipher operations are required for DES encryption and decryption. Hence, the data is routed through the DES core five times. On the sixth pass, the encrypted/decrypted data is taken from the output of the first cipher stage. This output can then be used to encrypt/decrypt any subsequent input data. A different key is supplied to each of the cipher stages for each cycle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.