Cryptology ePrint Archive: BibTeX Citation of Report 2013/818

@misc{cryptoeprint:2013:818,
    author = {Roberto De Prisco and Alfredo De Santis},
    title = {On the Relation of Random Grid, Probabilistic and Deterministic Visual Cryptography},
    howpublished = {Cryptology ePrint Archive, Report 2013/818},
    year = {2013},
    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.