* submitted to IEEE Transactions on Information Forensics and Security
(TIFS). arXiv admin note: substantial text overlap with arXiv:1901.00889 Access Paper or Ask Questions
* This work is accepted in IEEE Transactions on Biometrics, Behavior,
and Identity Science (T-BIOM). arXiv admin note: substantial text overlap
with arXiv:1801.00077 Access Paper or Ask Questions