@misc{cryptoeprint:2014:381,
author = {Christina Brzuska and Arno Mittelbach},
title = {Using Indistinguishability Obfuscation via UCEs},
howpublished = {Cryptology ePrint Archive, Report 2014/381},
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.