@misc{cryptoeprint:2003:160,
author = {Jiun-Ming Chen and Bo-Yin Yang},
title = {A More Secure and Efficacious TTS Signature Scheme},
howpublished = {Cryptology ePrint Archive, Report 2003/160},
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.