@misc{cryptoeprint:2012:626,
author = {Xi Xiong and Haining Fan},
title = {Bit-Parallel $GF(2^{n})$ Squarer Using Shifted Polynomial Basis},
howpublished = {Cryptology ePrint Archive, Report 2012/626},
year = {2012},
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.