@misc{cryptoeprint:2002:183,
author = {Claude Cr\'epeau and Alain Slakmon},
title = {Simple backdoors to RSA key generation},
howpublished = {Cryptology ePrint Archive, Report 2002/183},
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.