@misc{cryptoeprint:2002:155,
author = {Steven D. Galbraith, Herbie J. Hopkins, Igor E. Shparlinski},
title = {Secure Bilinear Diffie-Hellman Bits},
howpublished = {Cryptology ePrint Archive, Report 2002/155},
year = {2002},
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.