Cryptology ePrint Archive: BibTeX Citation of Report 2012/168

@misc{cryptoeprint:2012:168,
    author = {Val\'erie Gauthier and  Ayoub Otmani and Jean-Pierre Tillich},
    title = {A Distinguisher-Based Attack of a Homomorphic Encryption   Scheme Relying on Reed-Solomon Codes},
    howpublished = {Cryptology ePrint Archive, Report 2012/168},
    year = {2012},
    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.