@misc{cryptoeprint:2012:205,
author = {J.C. Mitchell, R. Sharma, D. Stefan and J. Zimmerman},
title = {Information-flow control for programming on encrypted data},
howpublished = {Cryptology ePrint Archive, Report 2012/205},
year = {2012},
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.