@misc{cryptoeprint:2007:335,
author = {Sergei Evdokimov and Oliver Guenther},
title = {Encryption Techniques for Secure Database Outsourcing},
howpublished = {Cryptology ePrint Archive, Report 2007/335},
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.