@misc{cryptoeprint:2001:089,
    author = {Carles Padró and Ignacio Gracia and Sebastiŕ Martín and Paz Morillo},
    title = {Linear broadcast encryption schemes},
    howpublished = {Cryptology ePrint Archive, Report 2001/089},
    year = {2001},
    url = {http://eprint.iacr.org/2001/089},
}