@misc{cryptoeprint:2011:578,
author = {Balasingham Balamohan},
title = {ACCELERATING THE SCALAR MULTIPLICATION ON GENUS 2 HYPERELLIPTIC CURVE CRYPTOSYSTEMS},
howpublished = {Cryptology ePrint Archive, Report 2011/578},
year = {2011},
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.