@misc{cryptoeprint:2014:271,
author = {Markku-Juhani O. Saarinen},
title = {STRIBOB: Authenticated Encryption from GOST R 34.11-2012 LPS Permutation},
howpublished = {Cryptology ePrint Archive, Report 2014/271},
year = {2014},
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.