@misc{cryptoeprint:2012:554,
author = {Youngjoo Shin, Junbeom Hur, Kwangjo Kim},
title = {Security weakness in the Proof of Storage with Deduplication},
howpublished = {Cryptology ePrint Archive, Report 2012/554},
year = {2012},
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.