@misc{cryptoeprint:2011:185,
author = {Zhibin Zhou and Dijiang Huang},
title = {Efficient and Secure Data Storage Operations for Mobile Cloud Computing},
howpublished = {Cryptology ePrint Archive, Report 2011/185},
year = {2011},
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.