HE, L.; LIN, X.; YU, H. Improved Preimage Attacks on 4-Round Keccak-224/256. IACR Transactions on Symmetric Cryptology, [S. l.], v. 2021, n. 1, p. 217–238, 2021. DOI: 10.46586/tosc.v2021.i1.217-238. Disponível em: https://tosc.iacr.org/index.php/ToSC/article/view/8838. Acesso em: 8 dec. 2021.