@misc{cryptoeprint:2015:291,
author = {Takeshi Sugawara, Daisuke Suzuki, and Minoru Saeki},
title = {Two Operands of Multipliers in Side-Channel Attack},
howpublished = {Cryptology ePrint Archive, Report 2015/291},
year = {2015},
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.