Cryptology ePrint Archive: BibTeX Citation of Report 2012/115

@misc{cryptoeprint:2012:115,
    author = {XU Chun-xiang and HE Xiao-hu and Daniel Abraha},
    title = {Cryptanalysis of auditing protocol proposed by Wang et al. for data storage security in Cloud Computing},
    howpublished = {Cryptology ePrint Archive, Report 2012/115},
    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.