Cryptology ePrint Archive: BibTeX Citation of Report 2011/025

@misc{cryptoeprint:2011:025,
    author = {Mihaela Ion and Giovanni Russello and Bruno Crispo},
    title = {Supporting Publication and Subscription Confidentiality in Pub/Sub Networks},
    howpublished = {Cryptology ePrint Archive, Report 2011/025},
    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.