@misc{cryptoeprint:2008:535,
    author = {Abhishek Parakh and Subhash Kak},
    title = {A Recursive Threshold Visual Cryptography Scheme},
    howpublished = {Cryptology ePrint Archive, Report 2008/535},
    year = {2008},
    url = {http://eprint.iacr.org/2008/535},
}