@misc{cryptoeprint:2010:545,
    author = {Feng Liu and Chuankun Wu},
    title = {Optimal XOR based (2,n)-Visual Cryptography Schemes},
    howpublished = {Cryptology ePrint Archive, Report 2010/545},
    year = {2010},
    url = {http://eprint.iacr.org/2010/545},
}