Gigerl, Barbara, et al. “Smooth Passage With the Guards: Second-Order Hardware Masking of the AES With Low Randomness and Low Latency”. IACR Transactions on Cryptographic Hardware and Embedded Systems, vol. 2024, no. 1, Dec. 2023, pp. 309-35, doi:10.46586/tches.v2024.i1.309-335.