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:
Apr. 22, 2014
Filed:
May. 19, 2011
Elena Vasilievna Trichina, Munich, DE;
Elena Vasilievna Trichina, Munich, DE;
Spansion LLC, Sunnyvale, CA (US);
Abstract
Processing of masked data using multiple lookup tables (LUTs), or sub-tables, is described. For each input value, an appropriate sub-table provides an output value that is the result of a non-linear transformation (e.g., byte substitution) applied to the input value. An additive mask can be applied to the input data. A transformation can be applied to the masked input data to transform the additive mask into a multiplicative-additive mask. Selected bits of the masked input data and the bits in the additive component of the multiplicative-additive mask can be used in combination to select one of the sub-tables. An entry in the selected sub-table, corresponding to a transformed version of the input data, can then be identified.