@misc{cryptoeprint:2013:614,
author = {Douglas R. Stinson and Jalaj Upadhyay},
title = {Is extracting data the same as possessing data?},
howpublished = {Cryptology ePrint Archive, Report 2013/614},
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.