Cryptography – Particular algorithmic function encoding
Reexamination Certificate
2011-06-28
2011-06-28
Lanier, Benjamin E (Department: 2432)
Cryptography
Particular algorithmic function encoding
Reexamination Certificate
active
07970129
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.
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Kanaan Simon
Lanier Benjamin E
Spansion LLC
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