Patent ID: 9189425
Filing Date: 2015-11-17
Classification: G06F,G09C,H04L

Abstract:
1. A computer-implemented method of obtaining an original (non-obfuscated) table entry T[x], the X th value of a lookup table T that encodes one or more operations of a cryptographic process, from an obfuscated lookup table T′ stored in a computer readable memory circuit of a computing system that includes a processing system having at least one hardware processor, the method comprising: providing, by the processing system having at least one hardware processor, a value y=G accessing, in the computer readable memory circuit, the obfuscated lookup table T′ to obtain a value z=T′[y], where T′[y] is the y returning to the cryptographic process the original, non-obfuscated table entry T[x]=G