@misc{cryptoeprint:2005:198,
    author = {Ahto Buldas and Peeter Laud and Märt Saarepera and Jan Willemson},
    title = {Universally Composable Time-Stamping Schemes with Audit},
    howpublished = {Cryptology ePrint Archive, Report 2005/198},
    year = {2005},
    url = {http://eprint.iacr.org/2005/198},
}