@misc{cryptoeprint:2013:287,
author = {I. V. Chizhov and M. A. Borodin},
title = {The failure of McEliece PKC based on Reed-Muller codes.},
howpublished = {Cryptology ePrint Archive, Report 2013/287},
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.