@misc{cryptoeprint:2003:052,
author = {Vlastimil Klima and Ondrej Pokorny and Tomas Rosa},
title = {Attacking RSA-based Sessions in SSL/TLS},
howpublished = {Cryptology ePrint Archive, Report 2003/052},
year = {2003},
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.