Cryptology ePrint Archive: BibTeX Citation of Report 2002/018

    author       = {Jae Choon Cha and
		    Jung Hee Cheon},
    title        = {An Identity-Based Signature from Gap Diffie-Hellman Groups},
    howpublished = {Cryptology ePrint Archive, Report 2002/018},
    year         = {2002},
    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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