@misc{cryptoeprint:2015:137,
author = {Mikhail Strizhov and Indrajit Ray},
title = {Multi-keyword Similarity Search Over Encrypted Cloud Data},
howpublished = {Cryptology ePrint Archive, Report 2015/137},
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.