@misc{cryptoeprint:2013:373,
author = {Pierre-Alain Fouque and Antoine Joux and Mehdi Tibouchi},
title = {Injective Encoding to Elliptic Curves},
howpublished = {Cryptology ePrint Archive, Report 2013/373},
year = {2013},
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.