Bao, Zhenzhen, et al. “Improved Meet-in-the-Middle Preimage Attacks Against AES Hashing Modes”.
IACR Transactions on Symmetric Cryptology
, vol. 2019, no. 4, Jan. 2020, pp. 318-47,
https://doi.org/10.13154/tosc.v2019.i4.318-347
.