@misc{cryptoeprint:2015:401,
author = {Eike Kiltz and Daniel Masny and Krzysztof Pietrzak},
title = {Simple Chosen-Ciphertext Security from Low-Noise LPN},
howpublished = {Cryptology ePrint Archive, Report 2015/401},
year = {2015},
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.