@misc{cryptoeprint:2010:146,
author = {Santanu Sarkar and Subhamoy Maitra},
title = {Some Applications of Lattice Based Root Finding Techniques},
howpublished = {Cryptology ePrint Archive, Report 2010/146},
year = {2010},
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.