@misc{cryptoeprint:2003:254,
author = {Yitchak Gertner and Amir Herzberg},
title = {Committing Encryption and Publicly-Verifiable SignCryption},
howpublished = {Cryptology ePrint Archive, Report 2003/254},
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.