@misc{cryptoeprint:2009:622,
author = {WEI Yun, XIONG Guo-Hua, BAO Wan-Su and ZHANG Xing-Kai},
title = {A Strong Blind Signature Scheme over Braid Groups},
howpublished = {Cryptology ePrint Archive, Report 2009/622},
year = {2009},
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.