@misc{cryptoeprint:2009:358,
author = {Juan A. Garay and Vladimir Kolesnikov and Rae McLellan},
title = {MAC Precomputation with Applications to Secure Memory},
howpublished = {Cryptology ePrint Archive, Report 2009/358},
year = {2009},
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.