@misc{cryptoeprint:2015:341,
author = {Gilad Asharov and Gil Segev},
title = {Limits on the Power of Indistinguishability Obfuscation and Functional Encryption},
howpublished = {Cryptology ePrint Archive, Report 2015/341},
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.