SECURE DATA TRANSFORMATIONS

摘要

A system for performing a secure sequence of transformations of a data value, using encrypted representations of the data value is disclosed. The system comprises first transformation means 101 for applying a transformation to an input data value to obtain an obfuscated representation thereof, wherein the obfuscated representation contains a redundancy that depends on an input variable. The system comprises a sequence of second transformation means 102; 110 for applying a transformation to compute transformed obfuscated representations. The system further comprises fourth transformation means 103 for applying a transformation such that a last obfuscated transformed data is obtained. The system comprises fifth transformation means 104 for applying a transformation that depends on the last obfuscated transformed data and the input data.