@misc{cryptoeprint:2004:191,
author = {Pradeep Kumar Mishra},
title = {Scalar Multiplication in Elliptic Curve Cryptosystems: Pipelining with Pre-computations},
howpublished = {Cryptology ePrint Archive, Report 2004/191},
year = {2004},
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.