@misc{cryptoeprint:2009:381,
author = {Habeeb Syed},
title = {A short Note on Discrete Log Problem in $\mathbbF_p$},
howpublished = {Cryptology ePrint Archive, Report 2009/381},
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.