@misc{cryptoeprint:2014:197,
author = {Jian Guo and Jérémy Jean and Thomas Peyrin and Wang Lei},
title = {Breaking POET Authentication with a Single Query},
howpublished = {Cryptology ePrint Archive, Report 2014/197},
year = {2014},
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.