Data obfuscation
US8588406B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 18, 2006 |
| Grant date | Nov 19, 2013 |
| Priority date | — |
| Expiry date | May 26, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/12
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A portion of data is obfuscated by performing a bitwise XOR function between bits of the data portion and bits of a mask. The mask is generated based on the memory address of the data portion. A bitfield representing the memory address of the data portion is split into subset bitfields. Each subset then forms the input of a corresponding primary randomizing unit. Each primary randomizing unit is arranged to generate an output bitfield that appears to be randomly correlated with the input, but which may be determined from the input if certain secret information is known. The output of the primary randomizing units is input into a series of secondary randomizing units. Each secondary randomizing unit is arranged to input at least one bit of the output of every primary randomizing unit. The output of the secondary randomizing units are then combined by concatenation to form a data mask.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.