@misc{cryptoeprint:2015:993,
author = {Daniel Apon and Xiong Fan and Feng-Hao Liu},
title = {Bi-Deniable Inner Product Encryption from LWE},
howpublished = {Cryptology ePrint Archive, Report 2015/993},
year = {2015},
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.