@misc{cryptoeprint:2009:488,
author = {Rajesh P Singh and A.Saikia and B.K.Sarma },
title = {Little Dragon Two: An efficient Multivariate Public Key Cryptosystem},
howpublished = {Cryptology ePrint Archive, Report 2009/488},
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.