@misc{cryptoeprint:2014:180,
author = {T.D.B Weerasinghe},
title = {Improving throughput of RC4 algorithm using multithreading techniques in multicore processors},
howpublished = {Cryptology ePrint Archive, Report 2014/180},
year = {2014},
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.