An Improved Second-Order Power Analysis Attack Based on a New Refined Expecter: Case Study on Protected AES

摘要

This work proposes an improved second-order correlation power analysis attack based on a new refined expecter (RE). The predicted RE with the correct secret key is related to the Hamming weight of the Sbox output mask with a correlation coefficient of 0.35. It gives an improved attack performance in comparison with a traditional second-order attack which exhibits a correlation value of 0.24. In order to verify the practicability and performance of the proposed attack, we perform experiments on both simulated data and an AES implementation on an ARM SecureCore device, protected with first-order masking and shuffling countermeasures. The results demonstrate that our proposed attack outperforms the conventional second-order attack.