Cryptology ePrint Archive: BibTeX Citation of Report 2004/294

    author       = {Souradyuti Paul and
		    Bart Preneel},
    title        = {Solving Systems of Differential Equations of Addition and Cryptanalysis of the Helix Cipher},
    howpublished = {Cryptology ePrint Archive, Report 2004/294},
    year         = {2004},
    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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