@misc{cryptoeprint:1997:011,
author = {Joe Kilian and Erez Petrank },
title = {Identity Escrow },
howpublished = {Cryptology ePrint Archive, Report 1997/011},
year = {1997},
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.