Cryptology ePrint Archive: BibTeX Citation of Report 2011/649

    author       = {Fanbao Liu and
		    Changxiang Shen and
		    Tao Xie and
		    Dengguo Feng},
    title        = {On the Security of NMAC and Its Variants},
    howpublished = {Cryptology ePrint Archive, Report 2011/649},
    year         = {2011},
    note         = {\url{}},

You will need the url.sty package (comes with most LaTeX installations) for the last line. Otherwise, remove the \url command.

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