@misc{cryptoeprint:2015:048,
author = {Ran Canetti and Yael Tauman Kalai and Omer Paneth},
title = {On Obfuscation with Random Oracles},
howpublished = {Cryptology ePrint Archive, Report 2015/048},
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.