Table lookup operation on masked data

摘要

Processing of masked data using table lookups is described. A mask is applied to input data to generate masked input data. The mask and the masked input data are used in combination to locate an entry in a lookup table. The entry corresponds to a transformed version of the input data.

主权项

1. A data processing method comprising:
applying a mask to input data to generate masked input data; transforming said masked input data into transformed data using byte substitution implemented using a lookup table (LUT); and for mask correction of said transformed data, using said masked input data and said mask in combination to locate an entry in said LUT, said entry corresponding to a transformed and unmasked version of said input data.