@misc{cryptoeprint:2009:364,
    author = {Nishanth Chandran and Vipul Goyal and Ryan Moriarty and Rafail Ostrovsky},
    title = {Position Based Cryptography},
    howpublished = {Cryptology ePrint Archive, Report 2009/364},
    year = {2009},
    url = {http://eprint.iacr.org/2009/364},
}