@misc{cryptoeprint:2014:603,
author = {Tarik Moataz and Erik-Oliver Blass and Guevara Noubir},
title = {Recursive Trees for Practical ORAM},
howpublished = {Cryptology ePrint Archive, Report 2014/603},
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.