Patent ID: 7801298
Filing Date: 2010-09-21
Classification: H04L

Abstract:
1. An apparatus for detecting a potential attack on a cryptographic calculation, which performs a calculation with at least one parameter, comprising: a first provider formed to provide a parameter masked according to a first masking algorithm; a first calculator formed to perform the calculation with the masked parameter in order to obtain a first masked result of the calculation; a remasker formed to remask the first masked result, which is formed to process the first masked result so that a remasked result masked according to a second masking algorithm is obtained; a second provider formed to provide a parameter masked according to the first masking algorithm; a second calculator formed to perform the calculation with the provided masked parameter in order to obtain a second masked result; and a result examiner formed to examine the remasked result and the second masked result in order to detect the potential attack.