Cryptology ePrint Archive: BibTeX Citation of Report 2012/682

@misc{cryptoeprint:2012:682,
    author = {Jiawei Yuan and Shucheng Yu},
    title = {Proofs of Retrievability with Public Verifiability and Constant Communication Cost in Cloud},
    howpublished = {Cryptology ePrint Archive, Report 2012/682},
    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.