Cryptology ePrint Archive: BibTeX Citation of Report 2006/066

@misc{cryptoeprint:2006:066,
    author = {John Solis and Gene Tsudik},
    title = {Simple and Flexible Private Revocation Checking},
    howpublished = {Cryptology ePrint Archive, Report 2006/066},
    year = {2006},
    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.