@misc{cryptoeprint:1996:009,
author = {Oded Goldreich, Shafi Goldwasser, and Shai Halevi},
title = {Collision-Free Hashing from Lattice Problems},
howpublished = {Cryptology ePrint Archive, Report 1996/009},
year = {1996},
note = {\url{http://eprint.iacr.org/}},
}
You will need the url.sty package (comes with most LaTeX installations) for the last line. Otherwise, remove the \url command.