METHOD, SERVER AND COMPUTER READABLE MEDIUM FOR OBFUSCATING A CRYPTOGRAPHIC FUNCTION

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]...

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Bibliographic Details
Main Authors MALLON, WILLEM, TRESCHER, JOACHIM, A, ESSER, NORBERT, C, GORISSEN, PAUL
Format Patent
LanguageEnglish
French
German
Published 18.07.2007
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Summary: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.
Bibliography:Application Number: EP20050795025