@misc{cryptoeprint:2003:247,
author = {Xinjun Du and
Ying Wang and
Jianhua Ge and
Yumin Wang},
title = {ID-based Authenticated Two Round Multi-Party Key Agreement},
howpublished = {Cryptology ePrint Archive, Report 2003/247},
year = {2003},
note = {\url{https://ia.cr/2003/247}},
}
You will need the url.sty package (comes with most LaTeX installations) for the last line. Otherwise, remove the \url command.