@misc{cryptoeprint:2013:714,
author = {Sanchita Barman, Bimal Roy},
title = {Method to secure data in the cloud while preserving summary statistics},
howpublished = {Cryptology ePrint Archive, Report 2013/714},
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.