Human Interactive Proofs
2. HIP 2005: Bethlehem, PA, USA
Henry S. Baird, Daniel P. Lopresti (Eds.): Human Interactive Proofs, Second International Workshop, HIP 2005, Bethlehem, PA, USA, May 19-20, 2005, Proceedings. Springer 2005 Lecture Notes in Computer Science 3517 ISBN 3-540-26001-3 [ contents ]



