Cryptology ePrint Archive: BibTeX Citation of Report 2002/194

@misc{cryptoeprint:2002:194,
    author = {P. Tuyls, H.D.L. Hollmann, J.H.v. Lint, L. Tolhuizen},
    title = {A polarisation based Visual Crypto System and its Secret Sharing Schemes},
    howpublished = {Cryptology ePrint Archive, Report 2002/194},
    year = {2002},
    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.