@misc{cryptoeprint:2014:127,
author = {S. M. Dehnavi and Alireza Rahimipour},
title = {Algebraic Properties of Modular Addition Modulo a Power of Two},
howpublished = {Cryptology ePrint Archive, Report 2014/127},
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.