Method and system for obfuscating a cryptographic function
US7881466B2 · kind B2 · utility
4Cited by
1References
21Claims
0Family size
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Key dates
| Filing date | Oct 24, 2005 |
| Grant date | Feb 1, 2011 |
| Priority date | — |
| Expiry date | Feb 13, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/16
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Embodiments include a system, wherein a server provides a cryptographic function F to an execution device in an obfuscated form. The function F composes output of a plurality of the mapping tables Ti (0≦i≦n; n≧1) using an Abelian group operator. A processor chooses tables O and C such that C[x] O[x]=0, x Di and creates tables T′i, 0≦i≦m; n≦m≦n+1, where for 0≦i≦n, each Table T′i represents the respective corresponding table Ti and at least one table T′o1, 0≦o1≦n, being formed through an Abelian composition of To1 and O, and at least one table T′c1, 0≦c1≦m, c1≠oj; being formed through an Abelian composition that includes C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.