@misc{cryptoeprint:2007:382,
author = {K. Kobara and K. Morozov and R. Overbeck},
title = {Oblivious Transfer via McEliece's PKC and Permuted Kernels},
howpublished = {Cryptology ePrint Archive, Report 2007/382},
year = {2007},
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.