@misc{cryptoeprint:2006:201,
author = {Chang'an Zhao and Fangguo Zhang and Jiwu Huang},
title = {Efficient Tate Pairing Computation Using Double-Base Chains},
howpublished = {Cryptology ePrint Archive, Report 2006/201},
year = {2006},
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.