@misc{cryptoeprint:2014:292,
author = {Leibo Li and Keting Jia},
title = {Improved Meet-in-the-Middle Attacks on Reduced-Round Camellia-192/256},
howpublished = {Cryptology ePrint Archive, Report 2014/292},
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.