@misc{cryptoeprint:2002:148,
author = {Phillip Rogaway},
title = {The EMD Mode of Operation (A Tweaked, Wide-Blocksize, Strong PRP)},
howpublished = {Cryptology ePrint Archive, Report 2002/148},
year = {2002},
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.