@misc{cryptoeprint:2007:312,
author = {Hyun-A Park, Bum Han Kim, Dong Hoon Lee, Yon Dohn Chung, and Justin Zhan },
title = {Secure Similarity Search},
howpublished = {Cryptology ePrint Archive, Report 2007/312},
year = {2007},
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.