Cryptology ePrint Archive: BibTeX Citation of Report 2007/071

@misc{cryptoeprint:2007:071,
    author = {Ahto Buldas and Sven Laur},
    title = {Knowledge-Binding Commitments with Applications in Time-Stamping (Full Version)},
    howpublished = {Cryptology ePrint Archive, Report 2007/071},
    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.