@misc{cryptoeprint:2010:558,
author = {Jintai Ding},
title = {Solving LWE problem with bounded errors in polynomial time},
howpublished = {Cryptology ePrint Archive, Report 2010/558},
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.