@misc{cryptoeprint:2013:865,
author = {Suvadeep Hajra and Debdeep Mukhopadhyay},
title = {SNR to Success Rate: Reaching the Limit of Non-Profiling DPA},
howpublished = {Cryptology ePrint Archive, Report 2013/865},
year = {2013},
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.