| 研究実績の概要 |
In this research, we largely improved the key recovery efficiency for the simple power analysis on the masked expanded AES round keys. Compared to existing work, we improved the key recovery speed up to 95%. In a certain scenario, the key recovery success rate is improved from 47% to 96%. These improvements come from several techniques as (1) new data structure in the key recovery, (2) improved information extraction from Hamming weights, (3) full usage of all leakage traces, and (4) optimized recovery sequence of the key bytes. We further extended the improved key recovery architecture considering more variations of the leakage model and the noise model. We designed a masking scheme to achieve the highest key recovery complexity using the limited randomness. The key concept is to maximize the computational distance between the key bytes using the same mask. We summarized the relationship between the security evaluation result and the masking schemes based on the established key recovery architecture. These relationships will be formalized to a few design principles of the masking schemes. The related research result is under submission.
Besides, inspired by this project, 1. we identified the unexpected information leakage of the alarm signal sent by a laser sensor that detects irregular current; 2. we investigated the possibility and the noise tolerance for the physical attack using the leakage from 5th AES round; and 3. we improved the key recovery efficiency of the template attack for recently proposed long-distance side-channel attack named screaming channel attack.
|
