@misc{cryptoeprint:2004:274,
author = {Meng Qing-shu and Yang min and Zhang huan-guo and Cui jing-song},
title = {A NOVEL ALGORITHM ENUMERATING BENT FUNCTIONS},
howpublished = {Cryptology ePrint Archive, Report 2004/274},
year = {2004},
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.