Cryptology ePrint Archive: BibTeX Citation of Report 2011/607

@misc{cryptoeprint:2011:607,
    author = {Carlos {Aguilar Melchor} and Slim Bettaieb and Philippe Gaborit and Javier Herranz},
    title = {Improving Additive and Multiplicative Homomorphic Encryption Schemes Based on Worst-Case Hardness Assumptions}},
    howpublished = {Cryptology ePrint Archive, Report 2011/607},
    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.