@misc{cryptoeprint:2009:306,
    author = {Alina Oprea and Kevin D. Bowers},
    title = {Authentic Time-Stamps for Archival Storage},
    howpublished = {Cryptology ePrint Archive, Report 2009/306},
    year = {2009},
    url = {http://eprint.iacr.org/2009/306},
}