@misc{cryptoeprint:2013:314,
author = {Timo Bartkewitz},
title = {Keyed Side-Channel Based Hashing for IP Protection using Wavelets},
howpublished = {Cryptology ePrint Archive, Report 2013/314},
year = {2013},
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.