@misc{cryptoeprint:2009:563,
author = {Dabin Zheng and Xiangyong Zeng and Lei Hu},
title = {A Family of $p$-ary Binomial Bent Functions},
howpublished = {Cryptology ePrint Archive, Report 2009/563},
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.