@misc{cryptoeprint:2009:592,
    author = {Ivan Damgård and Martin Geisler and Jesper Buus Nielsen},
    title = {From Passive to Covert Security at Low Cost},
    howpublished = {Cryptology ePrint Archive, Report 2009/592},
    year = {2009},
    url = {http://eprint.iacr.org/2009/592},
}