@misc{cryptoeprint:2014:423,
author = {Shai Halevi and William E. Hall and Charanjit S. Jutla},
title = {The Hash Function "Fugue"},
howpublished = {Cryptology ePrint Archive, Report 2014/423},
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.