Cryptology ePrint Archive: BibTeX Citation of Report 2011/052

@misc{cryptoeprint:2011:052,
    author = {Alex Escala and Javier Herranz and Paz Morillo},
    title = {Revocable Attribute-Based Signatures with Adaptive Security in the Standard Model},
    howpublished = {Cryptology ePrint Archive, Report 2011/052},
    year = {2011},
    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.