@article{markert-21-unlock-pins,
    author = {Markert, Philipp and Bailey, Daniel V. and Golla, Maximilian and D\"{u}rmuth, Markus and Aviv, Adam J.},
    title = {{On the Security of Smartphone Unlock PINs}},
    journal = {ACM Transactions on Privacy and Security},
    year = {2021},
    volume = {24},
    number = {4},
    pages = {30:1--30:36},
    month = nov,
    publisher = {ACM}
}