A new paper was accepted at the IEEE Transactions on Biometrics, Identity and Behavior (TBIOM):
Osorio-Roig, D., Rathgeb, C., Drozdowski, P., Terhörst, P., Štruc, V., & Busch, C. (2021). An Attack on Feature Level-based Facial Soft-biometric Privacy Enhancement. TBIOM 2022. [ArXiv PDF]