Cryptology ePrint Archive: BibTeX Citation of Report 2000/045

@misc{cryptoeprint:2000:045,
    author = {Ronald Cramer and Ivan Damg{\aa}rd and Philip MacKenzie},
    title = {Efficient Zero-Knowledge Proofs of Knowledge Without Intractability Assumptions},
    howpublished = {Cryptology ePrint Archive, Report 2000/045},
    year = {2000},
    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.