The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 01, 2011
Filed:
Oct. 24, 2005
Paul Gorissen, Eindhoven, NL;
Norbert C. Esser, San Jose, CA (US);
Willem Mallon, Eindhoven, NL;
Joachim Artur Trescher, Eindhoven, NL;
Paul Gorissen, Eindhoven, NL;
Norbert C. Esser, San Jose, CA (US);
Willem Mallon, Eindhoven, NL;
Joachim Artur Trescher, Eindhoven, NL;
Irdeto B.V., , NL;
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 T(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 Dand creates tables T', 0≦i≦m; n≦m≦n+1, where for 0≦i≦n, each Table T′represents the respective corresponding table Tand at least one table T′, 0≦o≦n, being formed through an Abelian composition of Tand O, and at least one table T′, 0≦c≦m, c≠o; being formed through an Abelian composition that includes C.