Cryptology ePrint Archive: BibTeX Citation of Report 2013/100

@misc{cryptoeprint:2013:100,
    author = {Niu Liu and Shaohua Tang and Lingling Xu},
    title = {Attacks and Comments on Several Recently Proposed Key Management Schemes},
    howpublished = {Cryptology ePrint Archive, Report 2013/100},
    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.