@misc{cryptoeprint:2011:112,
author = {Debiao He, Jin Hu},
title = {An efficient certificateless two-party authenticated key agreement scheme from pairings},
howpublished = {Cryptology ePrint Archive, Report 2011/112},
year = {2011},
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.