@misc{cryptoeprint:2014:687,
author = {Omer Egecioglu and Cetin Kaya Koc},
title = {Reducing the Complexity of Normal Basis Multiplication},
howpublished = {Cryptology ePrint Archive, Report 2014/687},
year = {2014},
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.