Cryptology ePrint Archive: BibTeX Citation of Report 2017/158

    author       = {Martin Potthast and
		    Christian Forler and
		    Eik List and
		    Stefan Lucks},
    title        = {Passphone: Outsourcing Phone-based Web Authentication while Protecting User Privacy},
    howpublished = {Cryptology ePrint Archive, Report 2017/158},
    year         = {2017},
    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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