Cryptology ePrint Archive: BibTeX Citation of Report 2007/462

@misc{cryptoeprint:2007:462,
    author = {Siamak F Shahandashti and Reihaneh Safavi-Naini},
    title = {Construction of Universal Designated-Verifier Signatures and Identity-Based Signatures from Standard Signatures},
    howpublished = {Cryptology ePrint Archive, Report 2007/462},
    year = {2007},
    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.