@misc{cryptoeprint:2013:727,
author = {Shafi Goldwasser and Vipul Goyal and Abhishek Jain and Amit Sahai},
title = {Multi-Input Functional Encryption},
howpublished = {Cryptology ePrint Archive, Report 2013/727},
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.