@misc{cryptoeprint:2013:040,
author = {Roohallah Rastaghi},
title = {An Efficient CCA2-Secure Variant of the McEliece Cryptosystem in the Standard Model},
howpublished = {Cryptology ePrint Archive, Report 2013/040},
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.