Threshold Puzzles: The Evolution of DoS-Resistant Authentication

@inproceedings{bocan2004threshold,
  author    = {Bocan, Valer},
  title     = {Threshold Puzzles: The Evolution of DoS-Resistant Authentication},
  booktitle = {CONTI 2004 — Periodica Politehnica, Transactions on Automatic Control and Computer Science},
  year      = {2004},
  volume    = {49 (63)},
  issn      = {1224-600X}
}