Cryptographic apparatus and method
US8634551B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 28, 2010 |
| Grant date | Jan 21, 2014 |
| Priority date | — |
| Expiry date | Apr 27, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/0625
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
This cryptographic apparatus executes calculations according to an FI function including a first non-linear function S9 and a second non-linear function S7, and includes a ROM recording a first table including, for each input X of 9 bits, a value obtained by exclusively ORing a first value and an first output from the function S9 with respect to the input X, wherein the first value is generated by shifting lower 7 bits in the first output to left by 9 bits, and a second table including, for each input Y of 7 bits, a value obtained by exclusively ORing a second value and the input Y, wherein the second value is generated by shifting a result of an exclusive OR of the input Y and a second output from the function S7 with respect to the input Y to left by 9 bits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.